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Finding the Fourth Proportional to 743.73, 1,115.61 and 353.78

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Solution

The fourth proportional to 743.73, 1,115.61 and 353.78 is: 530.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.73 : 1,115.61 = 353.78 : x
  2. Step 2: Convert to fraction form
    743.73/1,115.61 = 353.78/x
  3. Step 3: Cross multiply
    743.73x = 1,115.61 × 353.78
  4. Step 4: Simplify right side
    743.73x = 394,673.16
  5. Step 5: Solve for x
    x = 394,673.16/743.73
  6. Step 6: Final answer
    x = 530.67

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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.