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Finding the Fourth Proportional to 615.48, 921.28 and 492.72

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Solution

The fourth proportional to 615.48, 921.28 and 492.72 is: 737.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.48 : 921.28 = 492.72 : x
  2. Step 2: Convert to fraction form
    615.48/921.28 = 492.72/x
  3. Step 3: Cross multiply
    615.48x = 921.28 × 492.72
  4. Step 4: Simplify right side
    615.48x = 453,933.08
  5. Step 5: Solve for x
    x = 453,933.08/615.48
  6. Step 6: Final answer
    x = 737.53

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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.