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Finding the Fourth Proportional to 116.20, 173.85 and 85.69

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Solution

The fourth proportional to 116.20, 173.85 and 85.69 is: 128.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.20 : 173.85 = 85.69 : x
  2. Step 2: Convert to fraction form
    116.20/173.85 = 85.69/x
  3. Step 3: Cross multiply
    116.20x = 173.85 × 85.69
  4. Step 4: Simplify right side
    116.20x = 14,897.10
  5. Step 5: Solve for x
    x = 14,897.10/116.20
  6. Step 6: Final answer
    x = 128.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.