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Finding the Fourth Proportional to 79.11, 117.62 and 75.87

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Solution

The fourth proportional to 79.11, 117.62 and 75.87 is: 112.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.11 : 117.62 = 75.87 : x
  2. Step 2: Convert to fraction form
    79.11/117.62 = 75.87/x
  3. Step 3: Cross multiply
    79.11x = 117.62 × 75.87
  4. Step 4: Simplify right side
    79.11x = 8,923.83
  5. Step 5: Solve for x
    x = 8,923.83/79.11
  6. Step 6: Final answer
    x = 112.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.