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Finding the Fourth Proportional to 144.66, 215.68 and 140.74

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Solution

The fourth proportional to 144.66, 215.68 and 140.74 is: 209.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.66 : 215.68 = 140.74 : x
  2. Step 2: Convert to fraction form
    144.66/215.68 = 140.74/x
  3. Step 3: Cross multiply
    144.66x = 215.68 × 140.74
  4. Step 4: Simplify right side
    144.66x = 30,354.80
  5. Step 5: Solve for x
    x = 30,354.80/144.66
  6. Step 6: Final answer
    x = 209.84

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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.