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Finding the Fourth Proportional to 391.10, 586.55 and 117.22

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Solution

The fourth proportional to 391.10, 586.55 and 117.22 is: 175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.10 : 586.55 = 117.22 : x
  2. Step 2: Convert to fraction form
    391.10/586.55 = 117.22/x
  3. Step 3: Cross multiply
    391.10x = 586.55 × 117.22
  4. Step 4: Simplify right side
    391.10x = 68,753.56
  5. Step 5: Solve for x
    x = 68,753.56/391.10
  6. Step 6: Final answer
    x = 175.80

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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.