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Finding the Fourth Proportional to 75.61, 112.73 and 74.86

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Solution

The fourth proportional to 75.61, 112.73 and 74.86 is: 111.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.61 : 112.73 = 74.86 : x
  2. Step 2: Convert to fraction form
    75.61/112.73 = 74.86/x
  3. Step 3: Cross multiply
    75.61x = 112.73 × 74.86
  4. Step 4: Simplify right side
    75.61x = 8,438.97
  5. Step 5: Solve for x
    x = 8,438.97/75.61
  6. Step 6: Final answer
    x = 111.61

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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.