Home / 2,118.18-3,177.55-783.80

Finding the Fourth Proportional to 2,118.18, 3,177.55 and 783.80

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Solution

The fourth proportional to 2,118.18, 3,177.55 and 783.80 is: 1,175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.18 : 3,177.55 = 783.80 : x
  2. Step 2: Convert to fraction form
    2,118.18/3,177.55 = 783.80/x
  3. Step 3: Cross multiply
    2,118.18x = 3,177.55 × 783.80
  4. Step 4: Simplify right side
    2,118.18x = 2,490,553.97
  5. Step 5: Solve for x
    x = 2,490,553.97/2,118.18
  6. Step 6: Final answer
    x = 1,175.80

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1.5x scale

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.