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Finding the Fourth Proportional to 744.15, 1,115.82 and 397.89

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Solution

The fourth proportional to 744.15, 1,115.82 and 397.89 is: 596.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.15 : 1,115.82 = 397.89 : x
  2. Step 2: Convert to fraction form
    744.15/1,115.82 = 397.89/x
  3. Step 3: Cross multiply
    744.15x = 1,115.82 × 397.89
  4. Step 4: Simplify right side
    744.15x = 443,973.62
  5. Step 5: Solve for x
    x = 443,973.62/744.15
  6. Step 6: Final answer
    x = 596.62

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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.