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Finding the Fourth Proportional to 663.46, 915.10 and 439.13

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Solution

The fourth proportional to 663.46, 915.10 and 439.13 is: 605.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.46 : 915.10 = 439.13 : x
  2. Step 2: Convert to fraction form
    663.46/915.10 = 439.13/x
  3. Step 3: Cross multiply
    663.46x = 915.10 × 439.13
  4. Step 4: Simplify right side
    663.46x = 401,849.05
  5. Step 5: Solve for x
    x = 401,849.05/663.46
  6. Step 6: Final answer
    x = 605.69

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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.