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Finding the Fourth Proportional to 115.02, 158.76 and 91.86

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Solution

The fourth proportional to 115.02, 158.76 and 91.86 is: 126.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.02 : 158.76 = 91.86 : x
  2. Step 2: Convert to fraction form
    115.02/158.76 = 91.86/x
  3. Step 3: Cross multiply
    115.02x = 158.76 × 91.86
  4. Step 4: Simplify right side
    115.02x = 14,583.23
  5. Step 5: Solve for x
    x = 14,583.23/115.02
  6. Step 6: Final answer
    x = 126.79

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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.