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Finding the Fourth Proportional to 98.56, 136.11 and 72.46

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Solution

The fourth proportional to 98.56, 136.11 and 72.46 is: 100.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.56 : 136.11 = 72.46 : x
  2. Step 2: Convert to fraction form
    98.56/136.11 = 72.46/x
  3. Step 3: Cross multiply
    98.56x = 136.11 × 72.46
  4. Step 4: Simplify right side
    98.56x = 9,862.53
  5. Step 5: Solve for x
    x = 9,862.53/98.56
  6. Step 6: Final answer
    x = 100.07

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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.