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Finding the Fourth Proportional to 57.79, 86.61 and 44.91

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Solution

The fourth proportional to 57.79, 86.61 and 44.91 is: 67.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.79 : 86.61 = 44.91 : x
  2. Step 2: Convert to fraction form
    57.79/86.61 = 44.91/x
  3. Step 3: Cross multiply
    57.79x = 86.61 × 44.91
  4. Step 4: Simplify right side
    57.79x = 3,889.66
  5. Step 5: Solve for x
    x = 3,889.66/57.79
  6. Step 6: Final answer
    x = 67.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.