Home / 681,067.66-939,791.07-390,664.18

Finding the Fourth Proportional to 681,067.66, 939,791.07 and 390,664.18

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Solution

The fourth proportional to 681,067.66, 939,791.07 and 390,664.18 is: 539,069.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,067.66 : 939,791.07 = 390,664.18 : x
  2. Step 2: Convert to fraction form
    681,067.66/939,791.07 = 390,664.18/x
  3. Step 3: Cross multiply
    681,067.66x = 939,791.07 × 390,664.18
  4. Step 4: Simplify right side
    681,067.66x = 367,142,707,732.87
  5. Step 5: Solve for x
    x = 367,142,707,732.87/681,067.66
  6. Step 6: Final answer
    x = 539,069.36

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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.