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Finding the Fourth Proportional to 744.35, 1,115.70 and 378.39

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Solution

The fourth proportional to 744.35, 1,115.70 and 378.39 is: 567.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.35 : 1,115.70 = 378.39 : x
  2. Step 2: Convert to fraction form
    744.35/1,115.70 = 378.39/x
  3. Step 3: Cross multiply
    744.35x = 1,115.70 × 378.39
  4. Step 4: Simplify right side
    744.35x = 422,169.72
  5. Step 5: Solve for x
    x = 422,169.72/744.35
  6. Step 6: Final answer
    x = 567.16

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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.