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Finding the Fourth Proportional to 45.60, 67.98 and 38.85

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Solution

The fourth proportional to 45.60, 67.98 and 38.85 is: 57.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.60 : 67.98 = 38.85 : x
  2. Step 2: Convert to fraction form
    45.60/67.98 = 38.85/x
  3. Step 3: Cross multiply
    45.60x = 67.98 × 38.85
  4. Step 4: Simplify right side
    45.60x = 2,641.02
  5. Step 5: Solve for x
    x = 2,641.02/45.60
  6. Step 6: Final answer
    x = 57.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.