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Finding the Fourth Proportional to 391.06, 586.55 and 147.61

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Solution

The fourth proportional to 391.06, 586.55 and 147.61 is: 221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.06 : 586.55 = 147.61 : x
  2. Step 2: Convert to fraction form
    391.06/586.55 = 147.61/x
  3. Step 3: Cross multiply
    391.06x = 586.55 × 147.61
  4. Step 4: Simplify right side
    391.06x = 86,579.91
  5. Step 5: Solve for x
    x = 86,579.91/391.06
  6. Step 6: Final answer
    x = 221.40

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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.