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Finding the Fourth Proportional to 743.67, 1,115.20 and 281.21

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Solution

The fourth proportional to 743.67, 1,115.20 and 281.21 is: 421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.67 : 1,115.20 = 281.21 : x
  2. Step 2: Convert to fraction form
    743.67/1,115.20 = 281.21/x
  3. Step 3: Cross multiply
    743.67x = 1,115.20 × 281.21
  4. Step 4: Simplify right side
    743.67x = 313,605.39
  5. Step 5: Solve for x
    x = 313,605.39/743.67
  6. Step 6: Final answer
    x = 421.70

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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.