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Finding the Fourth Proportional to 81.93, 112.95 and 74.19

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Solution

The fourth proportional to 81.93, 112.95 and 74.19 is: 102.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.93 : 112.95 = 74.19 : x
  2. Step 2: Convert to fraction form
    81.93/112.95 = 74.19/x
  3. Step 3: Cross multiply
    81.93x = 112.95 × 74.19
  4. Step 4: Simplify right side
    81.93x = 8,379.76
  5. Step 5: Solve for x
    x = 8,379.76/81.93
  6. Step 6: Final answer
    x = 102.28

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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.