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Finding the Fourth Proportional to 117.40, 161.86 and 98.95

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Solution

The fourth proportional to 117.40, 161.86 and 98.95 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.40 : 161.86 = 98.95 : x
  2. Step 2: Convert to fraction form
    117.40/161.86 = 98.95/x
  3. Step 3: Cross multiply
    117.40x = 161.86 × 98.95
  4. Step 4: Simplify right side
    117.40x = 16,016.05
  5. Step 5: Solve for x
    x = 16,016.05/117.40
  6. Step 6: Final answer
    x = 136.42

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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.