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Finding the Fourth Proportional to 615.60, 921.30 and 372.30

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Solution

The fourth proportional to 615.60, 921.30 and 372.30 is: 557.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.60 : 921.30 = 372.30 : x
  2. Step 2: Convert to fraction form
    615.60/921.30 = 372.30/x
  3. Step 3: Cross multiply
    615.60x = 921.30 × 372.30
  4. Step 4: Simplify right side
    615.60x = 342,999.99
  5. Step 5: Solve for x
    x = 342,999.99/615.60
  6. Step 6: Final answer
    x = 557.18

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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.