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Finding the Fourth Proportional to 97.39, 133.95 and 77.95

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Solution

The fourth proportional to 97.39, 133.95 and 77.95 is: 107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.39 : 133.95 = 77.95 : x
  2. Step 2: Convert to fraction form
    97.39/133.95 = 77.95/x
  3. Step 3: Cross multiply
    97.39x = 133.95 × 77.95
  4. Step 4: Simplify right side
    97.39x = 10,441.40
  5. Step 5: Solve for x
    x = 10,441.40/97.39
  6. Step 6: Final answer
    x = 107.21

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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.