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Finding the Fourth Proportional to 57.33, 79.11 and 38.90

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Solution

The fourth proportional to 57.33, 79.11 and 38.90 is: 53.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.33 : 79.11 = 38.90 : x
  2. Step 2: Convert to fraction form
    57.33/79.11 = 38.90/x
  3. Step 3: Cross multiply
    57.33x = 79.11 × 38.90
  4. Step 4: Simplify right side
    57.33x = 3,077.18
  5. Step 5: Solve for x
    x = 3,077.18/57.33
  6. Step 6: Final answer
    x = 53.68

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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.