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Finding the Fourth Proportional to 743.35, 1,115.40 and 353.79

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Solution

The fourth proportional to 743.35, 1,115.40 and 353.79 is: 530.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.35 : 1,115.40 = 353.79 : x
  2. Step 2: Convert to fraction form
    743.35/1,115.40 = 353.79/x
  3. Step 3: Cross multiply
    743.35x = 1,115.40 × 353.79
  4. Step 4: Simplify right side
    743.35x = 394,614.58
  5. Step 5: Solve for x
    x = 394,614.58/743.35
  6. Step 6: Final answer
    x = 530.86

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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.