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Finding the Fourth Proportional to 1,286.30, 1,774.94 and 726.72

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Solution

The fourth proportional to 1,286.30, 1,774.94 and 726.72 is: 1,002.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.30 : 1,774.94 = 726.72 : x
  2. Step 2: Convert to fraction form
    1,286.30/1,774.94 = 726.72/x
  3. Step 3: Cross multiply
    1,286.30x = 1,774.94 × 726.72
  4. Step 4: Simplify right side
    1,286.30x = 1,289,880.76
  5. Step 5: Solve for x
    x = 1,289,880.76/1,286.30
  6. Step 6: Final answer
    x = 1,002.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.