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Finding the Fourth Proportional to 45.38, 68.00 and 39.85

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Solution

The fourth proportional to 45.38, 68.00 and 39.85 is: 59.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.38 : 68.00 = 39.85 : x
  2. Step 2: Convert to fraction form
    45.38/68.00 = 39.85/x
  3. Step 3: Cross multiply
    45.38x = 68.00 × 39.85
  4. Step 4: Simplify right side
    45.38x = 2,709.43
  5. Step 5: Solve for x
    x = 2,709.43/45.38
  6. Step 6: Final answer
    x = 59.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.