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Finding the Fourth Proportional to 71.29, 98.79 and 69.92

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Solution

The fourth proportional to 71.29, 98.79 and 69.92 is: 96.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.29 : 98.79 = 69.92 : x
  2. Step 2: Convert to fraction form
    71.29/98.79 = 69.92/x
  3. Step 3: Cross multiply
    71.29x = 98.79 × 69.92
  4. Step 4: Simplify right side
    71.29x = 6,907.27
  5. Step 5: Solve for x
    x = 6,907.27/71.29
  6. Step 6: Final answer
    x = 96.89

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.