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Finding the Fourth Proportional to 142.18, 196.13 and 89.70

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Solution

The fourth proportional to 142.18, 196.13 and 89.70 is: 123.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.18 : 196.13 = 89.70 : x
  2. Step 2: Convert to fraction form
    142.18/196.13 = 89.70/x
  3. Step 3: Cross multiply
    142.18x = 196.13 × 89.70
  4. Step 4: Simplify right side
    142.18x = 17,592.86
  5. Step 5: Solve for x
    x = 17,592.86/142.18
  6. Step 6: Final answer
    x = 123.74

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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.