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Finding the Fourth Proportional to 69.84, 105.31 and 61.92

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Solution

The fourth proportional to 69.84, 105.31 and 61.92 is: 93.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.84 : 105.31 = 61.92 : x
  2. Step 2: Convert to fraction form
    69.84/105.31 = 61.92/x
  3. Step 3: Cross multiply
    69.84x = 105.31 × 61.92
  4. Step 4: Simplify right side
    69.84x = 6,520.80
  5. Step 5: Solve for x
    x = 6,520.80/69.84
  6. Step 6: Final answer
    x = 93.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.