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Finding the Fourth Proportional to 101.89, 140.70 and 69.18

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Solution

The fourth proportional to 101.89, 140.70 and 69.18 is: 95.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.89 : 140.70 = 69.18 : x
  2. Step 2: Convert to fraction form
    101.89/140.70 = 69.18/x
  3. Step 3: Cross multiply
    101.89x = 140.70 × 69.18
  4. Step 4: Simplify right side
    101.89x = 9,733.63
  5. Step 5: Solve for x
    x = 9,733.63/101.89
  6. Step 6: Final answer
    x = 95.53

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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.