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Finding the Fourth Proportional to 743.48, 1,113.78 and 396.70

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Solution

The fourth proportional to 743.48, 1,113.78 and 396.70 is: 594.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.48 : 1,113.78 = 396.70 : x
  2. Step 2: Convert to fraction form
    743.48/1,113.78 = 396.70/x
  3. Step 3: Cross multiply
    743.48x = 1,113.78 × 396.70
  4. Step 4: Simplify right side
    743.48x = 441,834.54
  5. Step 5: Solve for x
    x = 441,834.54/743.48
  6. Step 6: Final answer
    x = 594.28

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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.