Home / 2,115,917.89-2,920,860.47-1,428,520.78

Finding the Fourth Proportional to 2,115,917.89, 2,920,860.47 and 1,428,520.78

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Solution

The fourth proportional to 2,115,917.89, 2,920,860.47 and 1,428,520.78 is: 1,971,962.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115,917.89 : 2,920,860.47 = 1,428,520.78 : x
  2. Step 2: Convert to fraction form
    2,115,917.89/2,920,860.47 = 1,428,520.78/x
  3. Step 3: Cross multiply
    2,115,917.89x = 2,920,860.47 × 1,428,520.78
  4. Step 4: Simplify right side
    2,115,917.89x = 4,172,509,855,128.66
  5. Step 5: Solve for x
    x = 4,172,509,855,128.66/2,115,917.89
  6. Step 6: Final answer
    x = 1,971,962.09

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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.