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Finding the Fourth Proportional to 71.57, 107.77 and 51.42

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Solution

The fourth proportional to 71.57, 107.77 and 51.42 is: 77.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.57 : 107.77 = 51.42 : x
  2. Step 2: Convert to fraction form
    71.57/107.77 = 51.42/x
  3. Step 3: Cross multiply
    71.57x = 107.77 × 51.42
  4. Step 4: Simplify right side
    71.57x = 5,540.74
  5. Step 5: Solve for x
    x = 5,540.74/71.57
  6. Step 6: Final answer
    x = 77.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.