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Finding the Fourth Proportional to 49.35, 73.85 and 45.72

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Solution

The fourth proportional to 49.35, 73.85 and 45.72 is: 68.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.35 : 73.85 = 45.72 : x
  2. Step 2: Convert to fraction form
    49.35/73.85 = 45.72/x
  3. Step 3: Cross multiply
    49.35x = 73.85 × 45.72
  4. Step 4: Simplify right side
    49.35x = 3,376.42
  5. Step 5: Solve for x
    x = 3,376.42/49.35
  6. Step 6: Final answer
    x = 68.42

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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.