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Finding the Fourth Proportional to 743.89, 1,115.81 and 281.53

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Solution

The fourth proportional to 743.89, 1,115.81 and 281.53 is: 422.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.89 : 1,115.81 = 281.53 : x
  2. Step 2: Convert to fraction form
    743.89/1,115.81 = 281.53/x
  3. Step 3: Cross multiply
    743.89x = 1,115.81 × 281.53
  4. Step 4: Simplify right side
    743.89x = 314,133.99
  5. Step 5: Solve for x
    x = 314,133.99/743.89
  6. Step 6: Final answer
    x = 422.29

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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.