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Finding the Fourth Proportional to 101.66, 140.29 and 55.66

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Solution

The fourth proportional to 101.66, 140.29 and 55.66 is: 76.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.66 : 140.29 = 55.66 : x
  2. Step 2: Convert to fraction form
    101.66/140.29 = 55.66/x
  3. Step 3: Cross multiply
    101.66x = 140.29 × 55.66
  4. Step 4: Simplify right side
    101.66x = 7,808.54
  5. Step 5: Solve for x
    x = 7,808.54/101.66
  6. Step 6: Final answer
    x = 76.81

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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.