Home / 2,781.90-3,839.55-1,788.42

Finding the Fourth Proportional to 2,781.90, 3,839.55 and 1,788.42

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Solution

The fourth proportional to 2,781.90, 3,839.55 and 1,788.42 is: 2,468.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.90 : 3,839.55 = 1,788.42 : x
  2. Step 2: Convert to fraction form
    2,781.90/3,839.55 = 1,788.42/x
  3. Step 3: Cross multiply
    2,781.90x = 3,839.55 × 1,788.42
  4. Step 4: Simplify right side
    2,781.90x = 6,866,728.01
  5. Step 5: Solve for x
    x = 6,866,728.01/2,781.90
  6. Step 6: Final answer
    x = 2,468.36

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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.