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Finding the Fourth Proportional to 638,420.40, 957,630.60 and 259,340.40

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Solution

The fourth proportional to 638,420.40, 957,630.60 and 259,340.40 is: 389,010.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,420.40 : 957,630.60 = 259,340.40 : x
  2. Step 2: Convert to fraction form
    638,420.40/957,630.60 = 259,340.40/x
  3. Step 3: Cross multiply
    638,420.40x = 957,630.60 × 259,340.40
  4. Step 4: Simplify right side
    638,420.40x = 248,352,302,856.24
  5. Step 5: Solve for x
    x = 248,352,302,856.24/638,420.40
  6. Step 6: Final answer
    x = 389,010.60

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.