Home / 2,689.28-3,709.72-1,805.66

Finding the Fourth Proportional to 2,689.28, 3,709.72 and 1,805.66

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Solution

The fourth proportional to 2,689.28, 3,709.72 and 1,805.66 is: 2,490.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.28 : 3,709.72 = 1,805.66 : x
  2. Step 2: Convert to fraction form
    2,689.28/3,709.72 = 1,805.66/x
  3. Step 3: Cross multiply
    2,689.28x = 3,709.72 × 1,805.66
  4. Step 4: Simplify right side
    2,689.28x = 6,698,493.02
  5. Step 5: Solve for x
    x = 6,698,493.02/2,689.28
  6. Step 6: Final answer
    x = 2,490.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.