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Finding the Fourth Proportional to 709, 1,063.78 and 276.12

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Solution

The fourth proportional to 709, 1,063.78 and 276.12 is: 414.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    709 : 1,063.78 = 276.12 : x
  2. Step 2: Convert to fraction form
    709/1,063.78 = 276.12/x
  3. Step 3: Cross multiply
    709x = 1,063.78 × 276.12
  4. Step 4: Simplify right side
    709x = 293,730.93
  5. Step 5: Solve for x
    x = 293,730.93/709
  6. Step 6: Final answer
    x = 414.29

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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.