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Finding the Fourth Proportional to 743.87, 1,115.40 and 378.83

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Solution

The fourth proportional to 743.87, 1,115.40 and 378.83 is: 568.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.87 : 1,115.40 = 378.83 : x
  2. Step 2: Convert to fraction form
    743.87/1,115.40 = 378.83/x
  3. Step 3: Cross multiply
    743.87x = 1,115.40 × 378.83
  4. Step 4: Simplify right side
    743.87x = 422,551.19
  5. Step 5: Solve for x
    x = 422,551.19/743.87
  6. Step 6: Final answer
    x = 568.04

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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.