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Finding the Fourth Proportional to 71.96, 108.39 and 71.01

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Solution

The fourth proportional to 71.96, 108.39 and 71.01 is: 106.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.96 : 108.39 = 71.01 : x
  2. Step 2: Convert to fraction form
    71.96/108.39 = 71.01/x
  3. Step 3: Cross multiply
    71.96x = 108.39 × 71.01
  4. Step 4: Simplify right side
    71.96x = 7,696.51
  5. Step 5: Solve for x
    x = 7,696.51/71.96
  6. Step 6: Final answer
    x = 106.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.