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Finding the Fourth Proportional to 173.17, 259.77 and 86.50

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Solution

The fourth proportional to 173.17, 259.77 and 86.50 is: 129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.17 : 259.77 = 86.50 : x
  2. Step 2: Convert to fraction form
    173.17/259.77 = 86.50/x
  3. Step 3: Cross multiply
    173.17x = 259.77 × 86.50
  4. Step 4: Simplify right side
    173.17x = 22,470.75
  5. Step 5: Solve for x
    x = 22,470.75/173.17
  6. Step 6: Final answer
    x = 129.76

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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.