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Finding the Fourth Proportional to 116.78, 161.38 and 89.14

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Solution

The fourth proportional to 116.78, 161.38 and 89.14 is: 123.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161.38 = 89.14 : x
  2. Step 2: Convert to fraction form
    116.78/161.38 = 89.14/x
  3. Step 3: Cross multiply
    116.78x = 161.38 × 89.14
  4. Step 4: Simplify right side
    116.78x = 14,385.41
  5. Step 5: Solve for x
    x = 14,385.41/116.78
  6. Step 6: Final answer
    x = 123.18

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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.