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Finding the Fourth Proportional to 113.70, 156.86 and 69.43

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Solution

The fourth proportional to 113.70, 156.86 and 69.43 is: 95.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.70 : 156.86 = 69.43 : x
  2. Step 2: Convert to fraction form
    113.70/156.86 = 69.43/x
  3. Step 3: Cross multiply
    113.70x = 156.86 × 69.43
  4. Step 4: Simplify right side
    113.70x = 10,890.01
  5. Step 5: Solve for x
    x = 10,890.01/113.70
  6. Step 6: Final answer
    x = 95.78

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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.