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Finding the Fourth Proportional to 105.43, 157.98 and 82.57

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Solution

The fourth proportional to 105.43, 157.98 and 82.57 is: 123.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.43 : 157.98 = 82.57 : x
  2. Step 2: Convert to fraction form
    105.43/157.98 = 82.57/x
  3. Step 3: Cross multiply
    105.43x = 157.98 × 82.57
  4. Step 4: Simplify right side
    105.43x = 13,044.41
  5. Step 5: Solve for x
    x = 13,044.41/105.43
  6. Step 6: Final answer
    x = 123.73

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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.