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Finding the Fourth Proportional to 743.99, 1,115.75 and 353.87

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Solution

The fourth proportional to 743.99, 1,115.75 and 353.87 is: 530.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.99 : 1,115.75 = 353.87 : x
  2. Step 2: Convert to fraction form
    743.99/1,115.75 = 353.87/x
  3. Step 3: Cross multiply
    743.99x = 1,115.75 × 353.87
  4. Step 4: Simplify right side
    743.99x = 394,830.45
  5. Step 5: Solve for x
    x = 394,830.45/743.99
  6. Step 6: Final answer
    x = 530.69

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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.