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Finding the Fourth Proportional to 71.91, 106.65 and 71.33

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Solution

The fourth proportional to 71.91, 106.65 and 71.33 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.91 : 106.65 = 71.33 : x
  2. Step 2: Convert to fraction form
    71.91/106.65 = 71.33/x
  3. Step 3: Cross multiply
    71.91x = 106.65 × 71.33
  4. Step 4: Simplify right side
    71.91x = 7,606.81
  5. Step 5: Solve for x
    x = 7,606.81/71.91
  6. Step 6: Final answer
    x = 105.78

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.