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Finding the Fourth Proportional to 748.95, 1,123.37 and 439.83

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Solution

The fourth proportional to 748.95, 1,123.37 and 439.83 is: 659.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.95 : 1,123.37 = 439.83 : x
  2. Step 2: Convert to fraction form
    748.95/1,123.37 = 439.83/x
  3. Step 3: Cross multiply
    748.95x = 1,123.37 × 439.83
  4. Step 4: Simplify right side
    748.95x = 494,091.28
  5. Step 5: Solve for x
    x = 494,091.28/748.95
  6. Step 6: Final answer
    x = 659.72

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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.