Home / 259,781.61-389,784.68-139,698.21

Finding the Fourth Proportional to 259,781.61, 389,784.68 and 139,698.21

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Solution

The fourth proportional to 259,781.61, 389,784.68 and 139,698.21 is: 209,607.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,781.61 : 389,784.68 = 139,698.21 : x
  2. Step 2: Convert to fraction form
    259,781.61/389,784.68 = 139,698.21/x
  3. Step 3: Cross multiply
    259,781.61x = 389,784.68 × 139,698.21
  4. Step 4: Simplify right side
    259,781.61x = 54,452,222,081.42
  5. Step 5: Solve for x
    x = 54,452,222,081.42/259,781.61
  6. Step 6: Final answer
    x = 209,607.69

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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.