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Finding the Fourth Proportional to 744.52, 1,115.16 and 378.68

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Solution

The fourth proportional to 744.52, 1,115.16 and 378.68 is: 567.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.52 : 1,115.16 = 378.68 : x
  2. Step 2: Convert to fraction form
    744.52/1,115.16 = 378.68/x
  3. Step 3: Cross multiply
    744.52x = 1,115.16 × 378.68
  4. Step 4: Simplify right side
    744.52x = 422,288.79
  5. Step 5: Solve for x
    x = 422,288.79/744.52
  6. Step 6: Final answer
    x = 567.20

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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.