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Finding the Fourth Proportional to 142.86, 197.03 and 115.22

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Solution

The fourth proportional to 142.86, 197.03 and 115.22 is: 158.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.86 : 197.03 = 115.22 : x
  2. Step 2: Convert to fraction form
    142.86/197.03 = 115.22/x
  3. Step 3: Cross multiply
    142.86x = 197.03 × 115.22
  4. Step 4: Simplify right side
    142.86x = 22,701.80
  5. Step 5: Solve for x
    x = 22,701.80/142.86
  6. Step 6: Final answer
    x = 158.91

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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.