Home / 1,286.84-1,927.56-668.72

Finding the Fourth Proportional to 1,286.84, 1,927.56 and 668.72

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Solution

The fourth proportional to 1,286.84, 1,927.56 and 668.72 is: 1,001.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.84 : 1,927.56 = 668.72 : x
  2. Step 2: Convert to fraction form
    1,286.84/1,927.56 = 668.72/x
  3. Step 3: Cross multiply
    1,286.84x = 1,927.56 × 668.72
  4. Step 4: Simplify right side
    1,286.84x = 1,288,997.92
  5. Step 5: Solve for x
    x = 1,288,997.92/1,286.84
  6. Step 6: Final answer
    x = 1,001.68

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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.