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Finding the Fourth Proportional to 1,049.78, 1,575.19 and 743.60

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Solution

The fourth proportional to 1,049.78, 1,575.19 and 743.60 is: 1,115.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.78 : 1,575.19 = 743.60 : x
  2. Step 2: Convert to fraction form
    1,049.78/1,575.19 = 743.60/x
  3. Step 3: Cross multiply
    1,049.78x = 1,575.19 × 743.60
  4. Step 4: Simplify right side
    1,049.78x = 1,171,307.57
  5. Step 5: Solve for x
    x = 1,171,307.57/1,049.78
  6. Step 6: Final answer
    x = 1,115.76

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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.