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Finding the Fourth Proportional to 98.75, 136.27 and 57.31

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Solution

The fourth proportional to 98.75, 136.27 and 57.31 is: 79.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.75 : 136.27 = 57.31 : x
  2. Step 2: Convert to fraction form
    98.75/136.27 = 57.31/x
  3. Step 3: Cross multiply
    98.75x = 136.27 × 57.31
  4. Step 4: Simplify right side
    98.75x = 7,809.88
  5. Step 5: Solve for x
    x = 7,809.88/98.75
  6. Step 6: Final answer
    x = 79.09

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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.