Home / 2,138.15-3,206.95-677.45

Finding the Fourth Proportional to 2,138.15, 3,206.95 and 677.45

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Solution

The fourth proportional to 2,138.15, 3,206.95 and 677.45 is: 1,016.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.15 : 3,206.95 = 677.45 : x
  2. Step 2: Convert to fraction form
    2,138.15/3,206.95 = 677.45/x
  3. Step 3: Cross multiply
    2,138.15x = 3,206.95 × 677.45
  4. Step 4: Simplify right side
    2,138.15x = 2,172,548.28
  5. Step 5: Solve for x
    x = 2,172,548.28/2,138.15
  6. Step 6: Final answer
    x = 1,016.09

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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.