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Finding the Fourth Proportional to 39.02, 57.70 and 38.92

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Solution

The fourth proportional to 39.02, 57.70 and 38.92 is: 57.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.02 : 57.70 = 38.92 : x
  2. Step 2: Convert to fraction form
    39.02/57.70 = 38.92/x
  3. Step 3: Cross multiply
    39.02x = 57.70 × 38.92
  4. Step 4: Simplify right side
    39.02x = 2,245.68
  5. Step 5: Solve for x
    x = 2,245.68/39.02
  6. Step 6: Final answer
    x = 57.55

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.