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Finding the Fourth Proportional to 79.11, 117.86 and 77.36

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Solution

The fourth proportional to 79.11, 117.86 and 77.36 is: 115.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.11 : 117.86 = 77.36 : x
  2. Step 2: Convert to fraction form
    79.11/117.86 = 77.36/x
  3. Step 3: Cross multiply
    79.11x = 117.86 × 77.36
  4. Step 4: Simplify right side
    79.11x = 9,116.67
  5. Step 5: Solve for x
    x = 9,116.67/79.11
  6. Step 6: Final answer
    x = 115.24

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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.