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Finding the Fourth Proportional to 79.43, 109.81 and 71.23

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Solution

The fourth proportional to 79.43, 109.81 and 71.23 is: 98.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.43 : 109.81 = 71.23 : x
  2. Step 2: Convert to fraction form
    79.43/109.81 = 71.23/x
  3. Step 3: Cross multiply
    79.43x = 109.81 × 71.23
  4. Step 4: Simplify right side
    79.43x = 7,821.39
  5. Step 5: Solve for x
    x = 7,821.39/79.43
  6. Step 6: Final answer
    x = 98.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.