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Finding the Fourth Proportional to 79.07, 108.35 and 77.32

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Solution

The fourth proportional to 79.07, 108.35 and 77.32 is: 105.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.07 : 108.35 = 77.32 : x
  2. Step 2: Convert to fraction form
    79.07/108.35 = 77.32/x
  3. Step 3: Cross multiply
    79.07x = 108.35 × 77.32
  4. Step 4: Simplify right side
    79.07x = 8,377.08
  5. Step 5: Solve for x
    x = 8,377.08/79.07
  6. Step 6: Final answer
    x = 105.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.