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Finding the Fourth Proportional to 173.26, 259.78 and 86.57

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Solution

The fourth proportional to 173.26, 259.78 and 86.57 is: 129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.26 : 259.78 = 86.57 : x
  2. Step 2: Convert to fraction form
    173.26/259.78 = 86.57/x
  3. Step 3: Cross multiply
    173.26x = 259.78 × 86.57
  4. Step 4: Simplify right side
    173.26x = 22,489.15
  5. Step 5: Solve for x
    x = 22,489.15/173.26
  6. Step 6: Final answer
    x = 129.80

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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.