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Finding the Fourth Proportional to 125.58, 173.19 and 81.98

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Solution

The fourth proportional to 125.58, 173.19 and 81.98 is: 113.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.58 : 173.19 = 81.98 : x
  2. Step 2: Convert to fraction form
    125.58/173.19 = 81.98/x
  3. Step 3: Cross multiply
    125.58x = 173.19 × 81.98
  4. Step 4: Simplify right side
    125.58x = 14,198.12
  5. Step 5: Solve for x
    x = 14,198.12/125.58
  6. Step 6: Final answer
    x = 113.06

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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.