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Finding the Fourth Proportional to 643,978.64, 888,792.36 and 615,627.92

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Solution

The fourth proportional to 643,978.64, 888,792.36 and 615,627.92 is: 849,663.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,978.64 : 888,792.36 = 615,627.92 : x
  2. Step 2: Convert to fraction form
    643,978.64/888,792.36 = 615,627.92/x
  3. Step 3: Cross multiply
    643,978.64x = 888,792.36 × 615,627.92
  4. Step 4: Simplify right side
    643,978.64x = 547,165,391,898.69
  5. Step 5: Solve for x
    x = 547,165,391,898.69/643,978.64
  6. Step 6: Final answer
    x = 849,663.88

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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.