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Finding the Fourth Proportional to 442.79, 664.17 and 118.15

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Solution

The fourth proportional to 442.79, 664.17 and 118.15 is: 177.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.79 : 664.17 = 118.15 : x
  2. Step 2: Convert to fraction form
    442.79/664.17 = 118.15/x
  3. Step 3: Cross multiply
    442.79x = 664.17 × 118.15
  4. Step 4: Simplify right side
    442.79x = 78,470.03
  5. Step 5: Solve for x
    x = 78,470.03/442.79
  6. Step 6: Final answer
    x = 177.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.