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Finding the Fourth Proportional to 101.72, 140.43 and 77.22

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Solution

The fourth proportional to 101.72, 140.43 and 77.22 is: 106.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.72 : 140.43 = 77.22 : x
  2. Step 2: Convert to fraction form
    101.72/140.43 = 77.22/x
  3. Step 3: Cross multiply
    101.72x = 140.43 × 77.22
  4. Step 4: Simplify right side
    101.72x = 10,844.00
  5. Step 5: Solve for x
    x = 10,844.00/101.72
  6. Step 6: Final answer
    x = 106.61

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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.