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Finding the Fourth Proportional to 643,332.30, 887,781.42 and 371,391

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Solution

The fourth proportional to 643,332.30, 887,781.42 and 371,391 is: 512,509.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,332.30 : 887,781.42 = 371,391 : x
  2. Step 2: Convert to fraction form
    643,332.30/887,781.42 = 371,391/x
  3. Step 3: Cross multiply
    643,332.30x = 887,781.42 × 371,391
  4. Step 4: Simplify right side
    643,332.30x = 329,714,029,355.22
  5. Step 5: Solve for x
    x = 329,714,029,355.22/643,332.30
  6. Step 6: Final answer
    x = 512,509.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.