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Finding the Fourth Proportional to 79.09, 117.82 and 75.21

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Solution

The fourth proportional to 79.09, 117.82 and 75.21 is: 112.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.09 : 117.82 = 75.21 : x
  2. Step 2: Convert to fraction form
    79.09/117.82 = 75.21/x
  3. Step 3: Cross multiply
    79.09x = 117.82 × 75.21
  4. Step 4: Simplify right side
    79.09x = 8,861.24
  5. Step 5: Solve for x
    x = 8,861.24/79.09
  6. Step 6: Final answer
    x = 112.05

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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.