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Finding the Fourth Proportional to 391.08, 586.31 and 147.47

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Solution

The fourth proportional to 391.08, 586.31 and 147.47 is: 221.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.08 : 586.31 = 147.47 : x
  2. Step 2: Convert to fraction form
    391.08/586.31 = 147.47/x
  3. Step 3: Cross multiply
    391.08x = 586.31 × 147.47
  4. Step 4: Simplify right side
    391.08x = 86,459.47
  5. Step 5: Solve for x
    x = 86,459.47/391.08
  6. Step 6: Final answer
    x = 221.08

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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.