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Finding the Fourth Proportional to 615.20, 922.80 and 557.49

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Solution

The fourth proportional to 615.20, 922.80 and 557.49 is: 836.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.20 : 922.80 = 557.49 : x
  2. Step 2: Convert to fraction form
    615.20/922.80 = 557.49/x
  3. Step 3: Cross multiply
    615.20x = 922.80 × 557.49
  4. Step 4: Simplify right side
    615.20x = 514,451.77
  5. Step 5: Solve for x
    x = 514,451.77/615.20
  6. Step 6: Final answer
    x = 836.24

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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.