Home / 2,809.90-3,877.98-1,691.20

Finding the Fourth Proportional to 2,809.90, 3,877.98 and 1,691.20

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Solution

The fourth proportional to 2,809.90, 3,877.98 and 1,691.20 is: 2,334.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.90 : 3,877.98 = 1,691.20 : x
  2. Step 2: Convert to fraction form
    2,809.90/3,877.98 = 1,691.20/x
  3. Step 3: Cross multiply
    2,809.90x = 3,877.98 × 1,691.20
  4. Step 4: Simplify right side
    2,809.90x = 6,558,439.78
  5. Step 5: Solve for x
    x = 6,558,439.78/2,809.90
  6. Step 6: Final answer
    x = 2,334.05

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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.