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Finding the Fourth Proportional to 425,430.60, 638,145.90 and 215,478.60

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Solution

The fourth proportional to 425,430.60, 638,145.90 and 215,478.60 is: 323,217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,430.60 : 638,145.90 = 215,478.60 : x
  2. Step 2: Convert to fraction form
    425,430.60/638,145.90 = 215,478.60/x
  3. Step 3: Cross multiply
    425,430.60x = 638,145.90 × 215,478.60
  4. Step 4: Simplify right side
    425,430.60x = 137,506,785,127.74
  5. Step 5: Solve for x
    x = 137,506,785,127.74/425,430.60
  6. Step 6: Final answer
    x = 323,217.90

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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.