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Finding the Fourth Proportional to 75.97, 104.74 and 66.13

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Solution

The fourth proportional to 75.97, 104.74 and 66.13 is: 91.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.97 : 104.74 = 66.13 : x
  2. Step 2: Convert to fraction form
    75.97/104.74 = 66.13/x
  3. Step 3: Cross multiply
    75.97x = 104.74 × 66.13
  4. Step 4: Simplify right side
    75.97x = 6,926.46
  5. Step 5: Solve for x
    x = 6,926.46/75.97
  6. Step 6: Final answer
    x = 91.17

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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.