Home / 1,387,139.80-2,080,709.70-389,867.80

Finding the Fourth Proportional to 1,387,139.80, 2,080,709.70 and 389,867.80

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Solution

The fourth proportional to 1,387,139.80, 2,080,709.70 and 389,867.80 is: 584,801.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,139.80 : 2,080,709.70 = 389,867.80 : x
  2. Step 2: Convert to fraction form
    1,387,139.80/2,080,709.70 = 389,867.80/x
  3. Step 3: Cross multiply
    1,387,139.80x = 2,080,709.70 × 389,867.80
  4. Step 4: Simplify right side
    1,387,139.80x = 811,201,713,177.66
  5. Step 5: Solve for x
    x = 811,201,713,177.66/1,387,139.80
  6. Step 6: Final answer
    x = 584,801.70

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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.