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Finding the Fourth Proportional to 743.45, 1,115.18 and 353.36

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Solution

The fourth proportional to 743.45, 1,115.18 and 353.36 is: 530.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.45 : 1,115.18 = 353.36 : x
  2. Step 2: Convert to fraction form
    743.45/1,115.18 = 353.36/x
  3. Step 3: Cross multiply
    743.45x = 1,115.18 × 353.36
  4. Step 4: Simplify right side
    743.45x = 394,052.66
  5. Step 5: Solve for x
    x = 394,052.66/743.45
  6. Step 6: Final answer
    x = 530.04

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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.