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Finding the Fourth Proportional to 615,666.40, 921,944.40 and 404,159.20

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Solution

The fourth proportional to 615,666.40, 921,944.40 and 404,159.20 is: 605,217.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,666.40 : 921,944.40 = 404,159.20 : x
  2. Step 2: Convert to fraction form
    615,666.40/921,944.40 = 404,159.20/x
  3. Step 3: Cross multiply
    615,666.40x = 921,944.40 × 404,159.20
  4. Step 4: Simplify right side
    615,666.40x = 372,612,311,148.48
  5. Step 5: Solve for x
    x = 372,612,311,148.48/615,666.40
  6. Step 6: Final answer
    x = 605,217.88

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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.