Home / 1,286.57-1,928.01-636.55

Finding the Fourth Proportional to 1,286.57, 1,928.01 and 636.55

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Solution

The fourth proportional to 1,286.57, 1,928.01 and 636.55 is: 953.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.57 : 1,928.01 = 636.55 : x
  2. Step 2: Convert to fraction form
    1,286.57/1,928.01 = 636.55/x
  3. Step 3: Cross multiply
    1,286.57x = 1,928.01 × 636.55
  4. Step 4: Simplify right side
    1,286.57x = 1,227,274.77
  5. Step 5: Solve for x
    x = 1,227,274.77/1,286.57
  6. Step 6: Final answer
    x = 953.91

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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.