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Finding the Fourth Proportional to 144.27, 216.20 and 66.12

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Solution

The fourth proportional to 144.27, 216.20 and 66.12 is: 99.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.27 : 216.20 = 66.12 : x
  2. Step 2: Convert to fraction form
    144.27/216.20 = 66.12/x
  3. Step 3: Cross multiply
    144.27x = 216.20 × 66.12
  4. Step 4: Simplify right side
    144.27x = 14,295.14
  5. Step 5: Solve for x
    x = 14,295.14/144.27
  6. Step 6: Final answer
    x = 99.09

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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.