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Finding the Fourth Proportional to 615.31, 921.54 and 560.63

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Solution

The fourth proportional to 615.31, 921.54 and 560.63 is: 839.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.31 : 921.54 = 560.63 : x
  2. Step 2: Convert to fraction form
    615.31/921.54 = 560.63/x
  3. Step 3: Cross multiply
    615.31x = 921.54 × 560.63
  4. Step 4: Simplify right side
    615.31x = 516,642.97
  5. Step 5: Solve for x
    x = 516,642.97/615.31
  6. Step 6: Final answer
    x = 839.65

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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.