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Finding the Fourth Proportional to 391.25, 586.92 and 117.42

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Solution

The fourth proportional to 391.25, 586.92 and 117.42 is: 176.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 586.92 = 117.42 : x
  2. Step 2: Convert to fraction form
    391.25/586.92 = 117.42/x
  3. Step 3: Cross multiply
    391.25x = 586.92 × 117.42
  4. Step 4: Simplify right side
    391.25x = 68,916.15
  5. Step 5: Solve for x
    x = 68,916.15/391.25
  6. Step 6: Final answer
    x = 176.14

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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.