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Finding the Fourth Proportional to 147.91, 205.07 and 139.71

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Solution

The fourth proportional to 147.91, 205.07 and 139.71 is: 193.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.91 : 205.07 = 139.71 : x
  2. Step 2: Convert to fraction form
    147.91/205.07 = 139.71/x
  3. Step 3: Cross multiply
    147.91x = 205.07 × 139.71
  4. Step 4: Simplify right side
    147.91x = 28,650.33
  5. Step 5: Solve for x
    x = 28,650.33/147.91
  6. Step 6: Final answer
    x = 193.70

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.