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Finding the Fourth Proportional to 105.43, 157.92 and 91.39

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Solution

The fourth proportional to 105.43, 157.92 and 91.39 is: 136.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.43 : 157.92 = 91.39 : x
  2. Step 2: Convert to fraction form
    105.43/157.92 = 91.39/x
  3. Step 3: Cross multiply
    105.43x = 157.92 × 91.39
  4. Step 4: Simplify right side
    105.43x = 14,432.31
  5. Step 5: Solve for x
    x = 14,432.31/105.43
  6. Step 6: Final answer
    x = 136.89

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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.