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Finding the Fourth Proportional to 74.86, 111.75 and 71.82

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Solution

The fourth proportional to 74.86, 111.75 and 71.82 is: 107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.86 : 111.75 = 71.82 : x
  2. Step 2: Convert to fraction form
    74.86/111.75 = 71.82/x
  3. Step 3: Cross multiply
    74.86x = 111.75 × 71.82
  4. Step 4: Simplify right side
    74.86x = 8,025.62
  5. Step 5: Solve for x
    x = 8,025.62/74.86
  6. Step 6: Final answer
    x = 107.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.