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Finding the Fourth Proportional to 57.91, 79.68 and 45.61

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Solution

The fourth proportional to 57.91, 79.68 and 45.61 is: 62.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.91 : 79.68 = 45.61 : x
  2. Step 2: Convert to fraction form
    57.91/79.68 = 45.61/x
  3. Step 3: Cross multiply
    57.91x = 79.68 × 45.61
  4. Step 4: Simplify right side
    57.91x = 3,634.20
  5. Step 5: Solve for x
    x = 3,634.20/57.91
  6. Step 6: Final answer
    x = 62.76

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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.