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Finding the Fourth Proportional to 115.50, 159.45 and 76.18

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Solution

The fourth proportional to 115.50, 159.45 and 76.18 is: 105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.50 : 159.45 = 76.18 : x
  2. Step 2: Convert to fraction form
    115.50/159.45 = 76.18/x
  3. Step 3: Cross multiply
    115.50x = 159.45 × 76.18
  4. Step 4: Simplify right side
    115.50x = 12,147.11
  5. Step 5: Solve for x
    x = 12,147.11/115.50
  6. Step 6: Final answer
    x = 105.17

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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.