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Finding the Fourth Proportional to 117.03, 161.61 and 80.31

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Solution

The fourth proportional to 117.03, 161.61 and 80.31 is: 110.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.03 : 161.61 = 80.31 : x
  2. Step 2: Convert to fraction form
    117.03/161.61 = 80.31/x
  3. Step 3: Cross multiply
    117.03x = 161.61 × 80.31
  4. Step 4: Simplify right side
    117.03x = 12,978.90
  5. Step 5: Solve for x
    x = 12,978.90/117.03
  6. Step 6: Final answer
    x = 110.90

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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.