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Finding the Fourth Proportional to 638,420.60, 957,630.90 and 414,471.80

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Solution

The fourth proportional to 638,420.60, 957,630.90 and 414,471.80 is: 621,707.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,420.60 : 957,630.90 = 414,471.80 : x
  2. Step 2: Convert to fraction form
    638,420.60/957,630.90 = 414,471.80/x
  3. Step 3: Cross multiply
    638,420.60x = 957,630.90 × 414,471.80
  4. Step 4: Simplify right side
    638,420.60x = 396,911,002,858.62
  5. Step 5: Solve for x
    x = 396,911,002,858.62/638,420.60
  6. Step 6: Final answer
    x = 621,707.70

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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.