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Finding the Fourth Proportional to 743.66, 1,115.46 and 353.94

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Solution

The fourth proportional to 743.66, 1,115.46 and 353.94 is: 530.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.66 : 1,115.46 = 353.94 : x
  2. Step 2: Convert to fraction form
    743.66/1,115.46 = 353.94/x
  3. Step 3: Cross multiply
    743.66x = 1,115.46 × 353.94
  4. Step 4: Simplify right side
    743.66x = 394,798.57
  5. Step 5: Solve for x
    x = 394,798.57/743.66
  6. Step 6: Final answer
    x = 530.89

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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.