Home / 1,286.61-1,782.98-1,261.99

Finding the Fourth Proportional to 1,286.61, 1,782.98 and 1,261.99

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Solution

The fourth proportional to 1,286.61, 1,782.98 and 1,261.99 is: 1,748.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.61 : 1,782.98 = 1,261.99 : x
  2. Step 2: Convert to fraction form
    1,286.61/1,782.98 = 1,261.99/x
  3. Step 3: Cross multiply
    1,286.61x = 1,782.98 × 1,261.99
  4. Step 4: Simplify right side
    1,286.61x = 2,250,102.93
  5. Step 5: Solve for x
    x = 2,250,102.93/1,286.61
  6. Step 6: Final answer
    x = 1,748.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.