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Finding the Fourth Proportional to 144.72, 215.28 and 139.92

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Solution

The fourth proportional to 144.72, 215.28 and 139.92 is: 208.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.72 : 215.28 = 139.92 : x
  2. Step 2: Convert to fraction form
    144.72/215.28 = 139.92/x
  3. Step 3: Cross multiply
    144.72x = 215.28 × 139.92
  4. Step 4: Simplify right side
    144.72x = 30,121.98
  5. Step 5: Solve for x
    x = 30,121.98/144.72
  6. Step 6: Final answer
    x = 208.14

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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.