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Finding the Fourth Proportional to 744.04, 1,115.40 and 378.64

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Solution

The fourth proportional to 744.04, 1,115.40 and 378.64 is: 567.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.04 : 1,115.40 = 378.64 : x
  2. Step 2: Convert to fraction form
    744.04/1,115.40 = 378.64/x
  3. Step 3: Cross multiply
    744.04x = 1,115.40 × 378.64
  4. Step 4: Simplify right side
    744.04x = 422,335.06
  5. Step 5: Solve for x
    x = 422,335.06/744.04
  6. Step 6: Final answer
    x = 567.62

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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.