Home / 1,391,912.51-1,921,780.69-869,421.80

Finding the Fourth Proportional to 1,391,912.51, 1,921,780.69 and 869,421.80

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Solution

The fourth proportional to 1,391,912.51, 1,921,780.69 and 869,421.80 is: 1,200,390.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,912.51 : 1,921,780.69 = 869,421.80 : x
  2. Step 2: Convert to fraction form
    1,391,912.51/1,921,780.69 = 869,421.80/x
  3. Step 3: Cross multiply
    1,391,912.51x = 1,921,780.69 × 869,421.80
  4. Step 4: Simplify right side
    1,391,912.51x = 1,670,838,029,335.94
  5. Step 5: Solve for x
    x = 1,670,838,029,335.94/1,391,912.51
  6. Step 6: Final answer
    x = 1,200,390.13

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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.