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Finding the Fourth Proportional to 173.01, 259.55 and 86.39

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Solution

The fourth proportional to 173.01, 259.55 and 86.39 is: 129.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.01 : 259.55 = 86.39 : x
  2. Step 2: Convert to fraction form
    173.01/259.55 = 86.39/x
  3. Step 3: Cross multiply
    173.01x = 259.55 × 86.39
  4. Step 4: Simplify right side
    173.01x = 22,423.31
  5. Step 5: Solve for x
    x = 22,423.31/173.01
  6. Step 6: Final answer
    x = 129.61

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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.