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Finding the Fourth Proportional to 391.25, 586.89 and 134.75

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Solution

The fourth proportional to 391.25, 586.89 and 134.75 is: 202.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 586.89 = 134.75 : x
  2. Step 2: Convert to fraction form
    391.25/586.89 = 134.75/x
  3. Step 3: Cross multiply
    391.25x = 586.89 × 134.75
  4. Step 4: Simplify right side
    391.25x = 79,083.43
  5. Step 5: Solve for x
    x = 79,083.43/391.25
  6. Step 6: Final answer
    x = 202.13

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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.