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Finding the Fourth Proportional to 115.75, 159.74 and 76.94

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Solution

The fourth proportional to 115.75, 159.74 and 76.94 is: 106.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.75 : 159.74 = 76.94 : x
  2. Step 2: Convert to fraction form
    115.75/159.74 = 76.94/x
  3. Step 3: Cross multiply
    115.75x = 159.74 × 76.94
  4. Step 4: Simplify right side
    115.75x = 12,290.40
  5. Step 5: Solve for x
    x = 12,290.40/115.75
  6. Step 6: Final answer
    x = 106.18

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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.