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Finding the Fourth Proportional to 57.74, 79.58 and 39.31

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Solution

The fourth proportional to 57.74, 79.58 and 39.31 is: 54.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.74 : 79.58 = 39.31 : x
  2. Step 2: Convert to fraction form
    57.74/79.58 = 39.31/x
  3. Step 3: Cross multiply
    57.74x = 79.58 × 39.31
  4. Step 4: Simplify right side
    57.74x = 3,128.29
  5. Step 5: Solve for x
    x = 3,128.29/57.74
  6. Step 6: Final answer
    x = 54.18

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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.