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Finding the Fourth Proportional to 57.74, 79.69 and 39.30

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Solution

The fourth proportional to 57.74, 79.69 and 39.30 is: 54.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.74 : 79.69 = 39.30 : x
  2. Step 2: Convert to fraction form
    57.74/79.69 = 39.30/x
  3. Step 3: Cross multiply
    57.74x = 79.69 × 39.30
  4. Step 4: Simplify right side
    57.74x = 3,131.82
  5. Step 5: Solve for x
    x = 3,131.82/57.74
  6. Step 6: Final answer
    x = 54.24

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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.