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Finding the Fourth Proportional to 391.17, 586.84 and 113.53

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Solution

The fourth proportional to 391.17, 586.84 and 113.53 is: 170.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.17 : 586.84 = 113.53 : x
  2. Step 2: Convert to fraction form
    391.17/586.84 = 113.53/x
  3. Step 3: Cross multiply
    391.17x = 586.84 × 113.53
  4. Step 4: Simplify right side
    391.17x = 66,622.90
  5. Step 5: Solve for x
    x = 66,622.90/391.17
  6. Step 6: Final answer
    x = 170.32

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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.