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Finding the Fourth Proportional to 101.61, 140.10 and 68.81

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Solution

The fourth proportional to 101.61, 140.10 and 68.81 is: 94.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.61 : 140.10 = 68.81 : x
  2. Step 2: Convert to fraction form
    101.61/140.10 = 68.81/x
  3. Step 3: Cross multiply
    101.61x = 140.10 × 68.81
  4. Step 4: Simplify right side
    101.61x = 9,639.24
  5. Step 5: Solve for x
    x = 9,639.24/101.61
  6. Step 6: Final answer
    x = 94.87

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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.