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Finding the Fourth Proportional to 105.67, 158.10 and 71.47

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Solution

The fourth proportional to 105.67, 158.10 and 71.47 is: 106.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.67 : 158.10 = 71.47 : x
  2. Step 2: Convert to fraction form
    105.67/158.10 = 71.47/x
  3. Step 3: Cross multiply
    105.67x = 158.10 × 71.47
  4. Step 4: Simplify right side
    105.67x = 11,299.41
  5. Step 5: Solve for x
    x = 11,299.41/105.67
  6. Step 6: Final answer
    x = 106.93

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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.