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Finding the Fourth Proportional to 391.72, 587.22 and 148.06

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Solution

The fourth proportional to 391.72, 587.22 and 148.06 is: 221.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.72 : 587.22 = 148.06 : x
  2. Step 2: Convert to fraction form
    391.72/587.22 = 148.06/x
  3. Step 3: Cross multiply
    391.72x = 587.22 × 148.06
  4. Step 4: Simplify right side
    391.72x = 86,943.79
  5. Step 5: Solve for x
    x = 86,943.79/391.72
  6. Step 6: Final answer
    x = 221.95

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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.