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Finding the Fourth Proportional to 117.12, 161.61 and 99.71

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Solution

The fourth proportional to 117.12, 161.61 and 99.71 is: 137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.12 : 161.61 = 99.71 : x
  2. Step 2: Convert to fraction form
    117.12/161.61 = 99.71/x
  3. Step 3: Cross multiply
    117.12x = 161.61 × 99.71
  4. Step 4: Simplify right side
    117.12x = 16,113.33
  5. Step 5: Solve for x
    x = 16,113.33/117.12
  6. Step 6: Final answer
    x = 137.58

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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.