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Finding the Fourth Proportional to 101.85, 140.59 and 69.15

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Solution

The fourth proportional to 101.85, 140.59 and 69.15 is: 95.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.85 : 140.59 = 69.15 : x
  2. Step 2: Convert to fraction form
    101.85/140.59 = 69.15/x
  3. Step 3: Cross multiply
    101.85x = 140.59 × 69.15
  4. Step 4: Simplify right side
    101.85x = 9,721.80
  5. Step 5: Solve for x
    x = 9,721.80/101.85
  6. Step 6: Final answer
    x = 95.45

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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.