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Finding the Fourth Proportional to 744.66, 1,115.10 and 396.72

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Solution

The fourth proportional to 744.66, 1,115.10 and 396.72 is: 594.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.66 : 1,115.10 = 396.72 : x
  2. Step 2: Convert to fraction form
    744.66/1,115.10 = 396.72/x
  3. Step 3: Cross multiply
    744.66x = 1,115.10 × 396.72
  4. Step 4: Simplify right side
    744.66x = 442,382.47
  5. Step 5: Solve for x
    x = 442,382.47/744.66
  6. Step 6: Final answer
    x = 594.07

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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.