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Finding the Fourth Proportional to 638,137.20, 957,205.80 and 389,305.20

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Solution

The fourth proportional to 638,137.20, 957,205.80 and 389,305.20 is: 583,957.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,137.20 : 957,205.80 = 389,305.20 : x
  2. Step 2: Convert to fraction form
    638,137.20/957,205.80 = 389,305.20/x
  3. Step 3: Cross multiply
    638,137.20x = 957,205.80 × 389,305.20
  4. Step 4: Simplify right side
    638,137.20x = 372,645,195,410.16
  5. Step 5: Solve for x
    x = 372,645,195,410.16/638,137.20
  6. Step 6: Final answer
    x = 583,957.80

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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.