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Finding the Fourth Proportional to 97, 133.86 and 71.17

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Solution

The fourth proportional to 97, 133.86 and 71.17 is: 98.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    97 : 133.86 = 71.17 : x
  2. Step 2: Convert to fraction form
    97/133.86 = 71.17/x
  3. Step 3: Cross multiply
    97x = 133.86 × 71.17
  4. Step 4: Simplify right side
    97x = 9,526.82
  5. Step 5: Solve for x
    x = 9,526.82/97
  6. Step 6: Final answer
    x = 98.21

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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.