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Finding the Fourth Proportional to 116.90, 161.31 and 72.66

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Solution

The fourth proportional to 116.90, 161.31 and 72.66 is: 100.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.90 : 161.31 = 72.66 : x
  2. Step 2: Convert to fraction form
    116.90/161.31 = 72.66/x
  3. Step 3: Cross multiply
    116.90x = 161.31 × 72.66
  4. Step 4: Simplify right side
    116.90x = 11,720.78
  5. Step 5: Solve for x
    x = 11,720.78/116.90
  6. Step 6: Final answer
    x = 100.26

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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.