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Finding the Fourth Proportional to 144.13, 215.70 and 92.80

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Solution

The fourth proportional to 144.13, 215.70 and 92.80 is: 138.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.13 : 215.70 = 92.80 : x
  2. Step 2: Convert to fraction form
    144.13/215.70 = 92.80/x
  3. Step 3: Cross multiply
    144.13x = 215.70 × 92.80
  4. Step 4: Simplify right side
    144.13x = 20,016.96
  5. Step 5: Solve for x
    x = 20,016.96/144.13
  6. Step 6: Final answer
    x = 138.88

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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.