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Finding the Fourth Proportional to 742.87, 1,112.48 and 511.11

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Solution

The fourth proportional to 742.87, 1,112.48 and 511.11 is: 765.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.87 : 1,112.48 = 511.11 : x
  2. Step 2: Convert to fraction form
    742.87/1,112.48 = 511.11/x
  3. Step 3: Cross multiply
    742.87x = 1,112.48 × 511.11
  4. Step 4: Simplify right side
    742.87x = 568,591.53
  5. Step 5: Solve for x
    x = 568,591.53/742.87
  6. Step 6: Final answer
    x = 765.40

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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.