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Finding the Fourth Proportional to 1,286.92, 1,930.92 and 556.66

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Solution

The fourth proportional to 1,286.92, 1,930.92 and 556.66 is: 835.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.92 : 1,930.92 = 556.66 : x
  2. Step 2: Convert to fraction form
    1,286.92/1,930.92 = 556.66/x
  3. Step 3: Cross multiply
    1,286.92x = 1,930.92 × 556.66
  4. Step 4: Simplify right side
    1,286.92x = 1,074,865.93
  5. Step 5: Solve for x
    x = 1,074,865.93/1,286.92
  6. Step 6: Final answer
    x = 835.22

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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.