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Finding the Fourth Proportional to 115.72, 158.66 and 113.66

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Solution

The fourth proportional to 115.72, 158.66 and 113.66 is: 155.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.72 : 158.66 = 113.66 : x
  2. Step 2: Convert to fraction form
    115.72/158.66 = 113.66/x
  3. Step 3: Cross multiply
    115.72x = 158.66 × 113.66
  4. Step 4: Simplify right side
    115.72x = 18,033.30
  5. Step 5: Solve for x
    x = 18,033.30/115.72
  6. Step 6: Final answer
    x = 155.84

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.