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Finding the Fourth Proportional to 81.04, 111.88 and 51.92

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Solution

The fourth proportional to 81.04, 111.88 and 51.92 is: 71.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.04 : 111.88 = 51.92 : x
  2. Step 2: Convert to fraction form
    81.04/111.88 = 51.92/x
  3. Step 3: Cross multiply
    81.04x = 111.88 × 51.92
  4. Step 4: Simplify right side
    81.04x = 5,808.81
  5. Step 5: Solve for x
    x = 5,808.81/81.04
  6. Step 6: Final answer
    x = 71.68

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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.