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Finding the Fourth Proportional to 116.13, 159.90 and 98.61

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Solution

The fourth proportional to 116.13, 159.90 and 98.61 is: 135.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.13 : 159.90 = 98.61 : x
  2. Step 2: Convert to fraction form
    116.13/159.90 = 98.61/x
  3. Step 3: Cross multiply
    116.13x = 159.90 × 98.61
  4. Step 4: Simplify right side
    116.13x = 15,767.50
  5. Step 5: Solve for x
    x = 15,767.50/116.13
  6. Step 6: Final answer
    x = 135.77

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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.