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Finding the Fourth Proportional to 57.76, 79.68 and 39.31

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Solution

The fourth proportional to 57.76, 79.68 and 39.31 is: 54.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 79.68 = 39.31 : x
  2. Step 2: Convert to fraction form
    57.76/79.68 = 39.31/x
  3. Step 3: Cross multiply
    57.76x = 79.68 × 39.31
  4. Step 4: Simplify right side
    57.76x = 3,132.22
  5. Step 5: Solve for x
    x = 3,132.22/57.76
  6. Step 6: Final answer
    x = 54.23

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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.