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Finding the Fourth Proportional to 144.27, 215.31 and 140.64

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Solution

The fourth proportional to 144.27, 215.31 and 140.64 is: 209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.27 : 215.31 = 140.64 : x
  2. Step 2: Convert to fraction form
    144.27/215.31 = 140.64/x
  3. Step 3: Cross multiply
    144.27x = 215.31 × 140.64
  4. Step 4: Simplify right side
    144.27x = 30,281.20
  5. Step 5: Solve for x
    x = 30,281.20/144.27
  6. Step 6: Final answer
    x = 209.89

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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.