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Finding the Fourth Proportional to 125.31, 173.00 and 86.55

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Solution

The fourth proportional to 125.31, 173.00 and 86.55 is: 119.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.31 : 173.00 = 86.55 : x
  2. Step 2: Convert to fraction form
    125.31/173.00 = 86.55/x
  3. Step 3: Cross multiply
    125.31x = 173.00 × 86.55
  4. Step 4: Simplify right side
    125.31x = 14,972.72
  5. Step 5: Solve for x
    x = 14,972.72/125.31
  6. Step 6: Final answer
    x = 119.49

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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.