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Finding the Fourth Proportional to 144.80, 216.92 and 87.07

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Solution

The fourth proportional to 144.80, 216.92 and 87.07 is: 130.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.80 : 216.92 = 87.07 : x
  2. Step 2: Convert to fraction form
    144.80/216.92 = 87.07/x
  3. Step 3: Cross multiply
    144.80x = 216.92 × 87.07
  4. Step 4: Simplify right side
    144.80x = 18,886.90
  5. Step 5: Solve for x
    x = 18,886.90/144.80
  6. Step 6: Final answer
    x = 130.43

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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.