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Finding the Fourth Proportional to 98.59, 136.11 and 61.81

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Solution

The fourth proportional to 98.59, 136.11 and 61.81 is: 85.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.59 : 136.11 = 61.81 : x
  2. Step 2: Convert to fraction form
    98.59/136.11 = 61.81/x
  3. Step 3: Cross multiply
    98.59x = 136.11 × 61.81
  4. Step 4: Simplify right side
    98.59x = 8,411.97
  5. Step 5: Solve for x
    x = 8,411.97/98.59
  6. Step 6: Final answer
    x = 85.32

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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.