Home / 1,288.88-1,923.77-1,257.80

Finding the Fourth Proportional to 1,288.88, 1,923.77 and 1,257.80

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Solution

The fourth proportional to 1,288.88, 1,923.77 and 1,257.80 is: 1,877.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.88 : 1,923.77 = 1,257.80 : x
  2. Step 2: Convert to fraction form
    1,288.88/1,923.77 = 1,257.80/x
  3. Step 3: Cross multiply
    1,288.88x = 1,923.77 × 1,257.80
  4. Step 4: Simplify right side
    1,288.88x = 2,419,717.91
  5. Step 5: Solve for x
    x = 2,419,717.91/1,288.88
  6. Step 6: Final answer
    x = 1,877.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.