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Finding the Fourth Proportional to 98.75, 136.25 and 57.29

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Solution

The fourth proportional to 98.75, 136.25 and 57.29 is: 79.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 136.25 = 57.29 : x
  2. Step 2: Convert to fraction form
    98.75/136.25 = 57.29/x
  3. Step 3: Cross multiply
    98.75x = 136.25 × 57.29
  4. Step 4: Simplify right side
    98.75x = 7,805.76
  5. Step 5: Solve for x
    x = 7,805.76/98.75
  6. Step 6: Final answer
    x = 79.05

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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.