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Finding the Fourth Proportional to 142.92, 197.01 and 99.18

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Solution

The fourth proportional to 142.92, 197.01 and 99.18 is: 136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.92 : 197.01 = 99.18 : x
  2. Step 2: Convert to fraction form
    142.92/197.01 = 99.18/x
  3. Step 3: Cross multiply
    142.92x = 197.01 × 99.18
  4. Step 4: Simplify right side
    142.92x = 19,539.45
  5. Step 5: Solve for x
    x = 19,539.45/142.92
  6. Step 6: Final answer
    x = 136.72

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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.