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Finding the Fourth Proportional to 391.20, 586.72 and 147.60

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Solution

The fourth proportional to 391.20, 586.72 and 147.60 is: 221.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.20 : 586.72 = 147.60 : x
  2. Step 2: Convert to fraction form
    391.20/586.72 = 147.60/x
  3. Step 3: Cross multiply
    391.20x = 586.72 × 147.60
  4. Step 4: Simplify right side
    391.20x = 86,599.87
  5. Step 5: Solve for x
    x = 86,599.87/391.20
  6. Step 6: Final answer
    x = 221.37

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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.