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Finding the Fourth Proportional to 1,286.66, 1,930 and 713.18

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Solution

The fourth proportional to 1,286.66, 1,930 and 713.18 is: 1,069.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.66 : 1,930 = 713.18 : x
  2. Step 2: Convert to fraction form
    1,286.66/1,930 = 713.18/x
  3. Step 3: Cross multiply
    1,286.66x = 1,930 × 713.18
  4. Step 4: Simplify right side
    1,286.66x = 1,376,437.40
  5. Step 5: Solve for x
    x = 1,376,437.40/1,286.66
  6. Step 6: Final answer
    x = 1,069.78

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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.