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Finding the Fourth Proportional to 425,862.30, 638,793.45 and 215,472.90

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Solution

The fourth proportional to 425,862.30, 638,793.45 and 215,472.90 is: 323,209.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,862.30 : 638,793.45 = 215,472.90 : x
  2. Step 2: Convert to fraction form
    425,862.30/638,793.45 = 215,472.90/x
  3. Step 3: Cross multiply
    425,862.30x = 638,793.45 × 215,472.90
  4. Step 4: Simplify right side
    425,862.30x = 137,642,677,172.51
  5. Step 5: Solve for x
    x = 137,642,677,172.51/425,862.30
  6. Step 6: Final answer
    x = 323,209.35

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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.