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Finding the Fourth Proportional to 663.48, 915.61 and 397.96

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Solution

The fourth proportional to 663.48, 915.61 and 397.96 is: 549.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.48 : 915.61 = 397.96 : x
  2. Step 2: Convert to fraction form
    663.48/915.61 = 397.96/x
  3. Step 3: Cross multiply
    663.48x = 915.61 × 397.96
  4. Step 4: Simplify right side
    663.48x = 364,377.80
  5. Step 5: Solve for x
    x = 364,377.80/663.48
  6. Step 6: Final answer
    x = 549.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.