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Finding the Fourth Proportional to 142.95, 197.20 and 101.55

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Solution

The fourth proportional to 142.95, 197.20 and 101.55 is: 140.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.95 : 197.20 = 101.55 : x
  2. Step 2: Convert to fraction form
    142.95/197.20 = 101.55/x
  3. Step 3: Cross multiply
    142.95x = 197.20 × 101.55
  4. Step 4: Simplify right side
    142.95x = 20,025.66
  5. Step 5: Solve for x
    x = 20,025.66/142.95
  6. Step 6: Final answer
    x = 140.09

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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.