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Finding the Fourth Proportional to 98.91, 136.56 and 81.51

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Solution

The fourth proportional to 98.91, 136.56 and 81.51 is: 112.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.91 : 136.56 = 81.51 : x
  2. Step 2: Convert to fraction form
    98.91/136.56 = 81.51/x
  3. Step 3: Cross multiply
    98.91x = 136.56 × 81.51
  4. Step 4: Simplify right side
    98.91x = 11,131.01
  5. Step 5: Solve for x
    x = 11,131.01/98.91
  6. Step 6: Final answer
    x = 112.54

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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.