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Finding the Fourth Proportional to 663.28, 915.23 and 397.64

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Solution

The fourth proportional to 663.28, 915.23 and 397.64 is: 548.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.28 : 915.23 = 397.64 : x
  2. Step 2: Convert to fraction form
    663.28/915.23 = 397.64/x
  3. Step 3: Cross multiply
    663.28x = 915.23 × 397.64
  4. Step 4: Simplify right side
    663.28x = 363,935.34
  5. Step 5: Solve for x
    x = 363,935.34/663.28
  6. Step 6: Final answer
    x = 548.69

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1.5x scale

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.