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Finding the Fourth Proportional to 144.32, 215.17 and 139.79

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Solution

The fourth proportional to 144.32, 215.17 and 139.79 is: 208.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.32 : 215.17 = 139.79 : x
  2. Step 2: Convert to fraction form
    144.32/215.17 = 139.79/x
  3. Step 3: Cross multiply
    144.32x = 215.17 × 139.79
  4. Step 4: Simplify right side
    144.32x = 30,078.80
  5. Step 5: Solve for x
    x = 30,078.80/144.32
  6. Step 6: Final answer
    x = 208.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.