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Finding the Fourth Proportional to 1,286.74, 1,928.49 and 637.66

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Solution

The fourth proportional to 1,286.74, 1,928.49 and 637.66 is: 955.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.74 : 1,928.49 = 637.66 : x
  2. Step 2: Convert to fraction form
    1,286.74/1,928.49 = 637.66/x
  3. Step 3: Cross multiply
    1,286.74x = 1,928.49 × 637.66
  4. Step 4: Simplify right side
    1,286.74x = 1,229,720.93
  5. Step 5: Solve for x
    x = 1,229,720.93/1,286.74
  6. Step 6: Final answer
    x = 955.69

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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.