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Finding the Fourth Proportional to 144.24, 215.20 and 142.71

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Solution

The fourth proportional to 144.24, 215.20 and 142.71 is: 212.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.24 : 215.20 = 142.71 : x
  2. Step 2: Convert to fraction form
    144.24/215.20 = 142.71/x
  3. Step 3: Cross multiply
    144.24x = 215.20 × 142.71
  4. Step 4: Simplify right side
    144.24x = 30,710.84
  5. Step 5: Solve for x
    x = 30,710.84/144.24
  6. Step 6: Final answer
    x = 212.91

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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.