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Finding the Fourth Proportional to 743.11, 1,115.07 and 418.57

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Solution

The fourth proportional to 743.11, 1,115.07 and 418.57 is: 628.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.11 : 1,115.07 = 418.57 : x
  2. Step 2: Convert to fraction form
    743.11/1,115.07 = 418.57/x
  3. Step 3: Cross multiply
    743.11x = 1,115.07 × 418.57
  4. Step 4: Simplify right side
    743.11x = 466,734.85
  5. Step 5: Solve for x
    x = 466,734.85/743.11
  6. Step 6: Final answer
    x = 628.08

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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.