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Finding the Fourth Proportional to 738.48, 1,107.40 and 251.31

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Solution

The fourth proportional to 738.48, 1,107.40 and 251.31 is: 376.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.48 : 1,107.40 = 251.31 : x
  2. Step 2: Convert to fraction form
    738.48/1,107.40 = 251.31/x
  3. Step 3: Cross multiply
    738.48x = 1,107.40 × 251.31
  4. Step 4: Simplify right side
    738.48x = 278,293.90
  5. Step 5: Solve for x
    x = 278,293.90/738.48
  6. Step 6: Final answer
    x = 376.85

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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.