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Finding the Fourth Proportional to 105.91, 158.70 and 71.89

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Solution

The fourth proportional to 105.91, 158.70 and 71.89 is: 107.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.91 : 158.70 = 71.89 : x
  2. Step 2: Convert to fraction form
    105.91/158.70 = 71.89/x
  3. Step 3: Cross multiply
    105.91x = 158.70 × 71.89
  4. Step 4: Simplify right side
    105.91x = 11,408.15
  5. Step 5: Solve for x
    x = 11,408.15/105.91
  6. Step 6: Final answer
    x = 107.72

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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.