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Finding the Fourth Proportional to 117.11, 161.72 and 100.41

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Solution

The fourth proportional to 117.11, 161.72 and 100.41 is: 138.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.11 : 161.72 = 100.41 : x
  2. Step 2: Convert to fraction form
    117.11/161.72 = 100.41/x
  3. Step 3: Cross multiply
    117.11x = 161.72 × 100.41
  4. Step 4: Simplify right side
    117.11x = 16,237.80
  5. Step 5: Solve for x
    x = 16,237.80/117.11
  6. Step 6: Final answer
    x = 138.66

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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.