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Finding the Fourth Proportional to 143.18, 197.60 and 101.81

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Solution

The fourth proportional to 143.18, 197.60 and 101.81 is: 140.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.18 : 197.60 = 101.81 : x
  2. Step 2: Convert to fraction form
    143.18/197.60 = 101.81/x
  3. Step 3: Cross multiply
    143.18x = 197.60 × 101.81
  4. Step 4: Simplify right side
    143.18x = 20,117.66
  5. Step 5: Solve for x
    x = 20,117.66/143.18
  6. Step 6: Final answer
    x = 140.51

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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.