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Finding the Fourth Proportional to 663.12, 915.84 and 442.08

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Solution

The fourth proportional to 663.12, 915.84 and 442.08 is: 610.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.12 : 915.84 = 442.08 : x
  2. Step 2: Convert to fraction form
    663.12/915.84 = 442.08/x
  3. Step 3: Cross multiply
    663.12x = 915.84 × 442.08
  4. Step 4: Simplify right side
    663.12x = 404,874.55
  5. Step 5: Solve for x
    x = 404,874.55/663.12
  6. Step 6: Final answer
    x = 610.56

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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.