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Finding the Fourth Proportional to 663.53, 990.52 and 615.47

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Solution

The fourth proportional to 663.53, 990.52 and 615.47 is: 918.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.53 : 990.52 = 615.47 : x
  2. Step 2: Convert to fraction form
    663.53/990.52 = 615.47/x
  3. Step 3: Cross multiply
    663.53x = 990.52 × 615.47
  4. Step 4: Simplify right side
    663.53x = 609,635.34
  5. Step 5: Solve for x
    x = 609,635.34/663.53
  6. Step 6: Final answer
    x = 918.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.