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Finding the Fourth Proportional to 101.69, 140.40 and 78.33

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Solution

The fourth proportional to 101.69, 140.40 and 78.33 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.69 : 140.40 = 78.33 : x
  2. Step 2: Convert to fraction form
    101.69/140.40 = 78.33/x
  3. Step 3: Cross multiply
    101.69x = 140.40 × 78.33
  4. Step 4: Simplify right side
    101.69x = 10,997.53
  5. Step 5: Solve for x
    x = 10,997.53/101.69
  6. Step 6: Final answer
    x = 108.15

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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.