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Finding the Fourth Proportional to 101.71, 140.43 and 79.84

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Solution

The fourth proportional to 101.71, 140.43 and 79.84 is: 110.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.71 : 140.43 = 79.84 : x
  2. Step 2: Convert to fraction form
    101.71/140.43 = 79.84/x
  3. Step 3: Cross multiply
    101.71x = 140.43 × 79.84
  4. Step 4: Simplify right side
    101.71x = 11,211.93
  5. Step 5: Solve for x
    x = 11,211.93/101.71
  6. Step 6: Final answer
    x = 110.23

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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.