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Finding the Fourth Proportional to 71.91, 107.71 and 57.46

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Solution

The fourth proportional to 71.91, 107.71 and 57.46 is: 86.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.91 : 107.71 = 57.46 : x
  2. Step 2: Convert to fraction form
    71.91/107.71 = 57.46/x
  3. Step 3: Cross multiply
    71.91x = 107.71 × 57.46
  4. Step 4: Simplify right side
    71.91x = 6,189.02
  5. Step 5: Solve for x
    x = 6,189.02/71.91
  6. Step 6: Final answer
    x = 86.07

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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.