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Finding the Fourth Proportional to 113.75, 156.94 and 69.47

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Solution

The fourth proportional to 113.75, 156.94 and 69.47 is: 95.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.75 : 156.94 = 69.47 : x
  2. Step 2: Convert to fraction form
    113.75/156.94 = 69.47/x
  3. Step 3: Cross multiply
    113.75x = 156.94 × 69.47
  4. Step 4: Simplify right side
    113.75x = 10,902.62
  5. Step 5: Solve for x
    x = 10,902.62/113.75
  6. Step 6: Final answer
    x = 95.85

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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.