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Finding the Fourth Proportional to 98.75, 136.30 and 79.11

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Solution

The fourth proportional to 98.75, 136.30 and 79.11 is: 109.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 136.30 = 79.11 : x
  2. Step 2: Convert to fraction form
    98.75/136.30 = 79.11/x
  3. Step 3: Cross multiply
    98.75x = 136.30 × 79.11
  4. Step 4: Simplify right side
    98.75x = 10,782.69
  5. Step 5: Solve for x
    x = 10,782.69/98.75
  6. Step 6: Final answer
    x = 109.20

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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.