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Finding the Fourth Proportional to 744.56, 1,115.62 and 378.84

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Solution

The fourth proportional to 744.56, 1,115.62 and 378.84 is: 567.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.56 : 1,115.62 = 378.84 : x
  2. Step 2: Convert to fraction form
    744.56/1,115.62 = 378.84/x
  3. Step 3: Cross multiply
    744.56x = 1,115.62 × 378.84
  4. Step 4: Simplify right side
    744.56x = 422,646.85
  5. Step 5: Solve for x
    x = 422,646.85/744.56
  6. Step 6: Final answer
    x = 567.65

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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.