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Finding the Fourth Proportional to 49.39, 73.90 and 45.57

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Solution

The fourth proportional to 49.39, 73.90 and 45.57 is: 68.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.39 : 73.90 = 45.57 : x
  2. Step 2: Convert to fraction form
    49.39/73.90 = 45.57/x
  3. Step 3: Cross multiply
    49.39x = 73.90 × 45.57
  4. Step 4: Simplify right side
    49.39x = 3,367.62
  5. Step 5: Solve for x
    x = 3,367.62/49.39
  6. Step 6: Final answer
    x = 68.18

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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.