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Finding the Fourth Proportional to 663.43, 915.92 and 443.11

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Solution

The fourth proportional to 663.43, 915.92 and 443.11 is: 611.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.43 : 915.92 = 443.11 : x
  2. Step 2: Convert to fraction form
    663.43/915.92 = 443.11/x
  3. Step 3: Cross multiply
    663.43x = 915.92 × 443.11
  4. Step 4: Simplify right side
    663.43x = 405,851.10
  5. Step 5: Solve for x
    x = 405,851.10/663.43
  6. Step 6: Final answer
    x = 611.75

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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.