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Finding the Fourth Proportional to 75.74, 104.47 and 66.55

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Solution

The fourth proportional to 75.74, 104.47 and 66.55 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.74 : 104.47 = 66.55 : x
  2. Step 2: Convert to fraction form
    75.74/104.47 = 66.55/x
  3. Step 3: Cross multiply
    75.74x = 104.47 × 66.55
  4. Step 4: Simplify right side
    75.74x = 6,952.48
  5. Step 5: Solve for x
    x = 6,952.48/75.74
  6. Step 6: Final answer
    x = 91.79

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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.