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Finding the Fourth Proportional to 1,375.85, 2,064.08 and 438.78

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Solution

The fourth proportional to 1,375.85, 2,064.08 and 438.78 is: 658.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.85 : 2,064.08 = 438.78 : x
  2. Step 2: Convert to fraction form
    1,375.85/2,064.08 = 438.78/x
  3. Step 3: Cross multiply
    1,375.85x = 2,064.08 × 438.78
  4. Step 4: Simplify right side
    1,375.85x = 905,685.86
  5. Step 5: Solve for x
    x = 905,685.86/1,375.85
  6. Step 6: Final answer
    x = 658.27

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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.