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Finding the Fourth Proportional to 142.43, 196.47 and 87.15

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Solution

The fourth proportional to 142.43, 196.47 and 87.15 is: 120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.43 : 196.47 = 87.15 : x
  2. Step 2: Convert to fraction form
    142.43/196.47 = 87.15/x
  3. Step 3: Cross multiply
    142.43x = 196.47 × 87.15
  4. Step 4: Simplify right side
    142.43x = 17,122.36
  5. Step 5: Solve for x
    x = 17,122.36/142.43
  6. Step 6: Final answer
    x = 120.21

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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.