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Finding the Fourth Proportional to 143.88, 198.45 and 87.87

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Solution

The fourth proportional to 143.88, 198.45 and 87.87 is: 121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.88 : 198.45 = 87.87 : x
  2. Step 2: Convert to fraction form
    143.88/198.45 = 87.87/x
  3. Step 3: Cross multiply
    143.88x = 198.45 × 87.87
  4. Step 4: Simplify right side
    143.88x = 17,437.80
  5. Step 5: Solve for x
    x = 17,437.80/143.88
  6. Step 6: Final answer
    x = 121.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.