Home / 1,391,939.48-1,920,844.78-811,126.28

Finding the Fourth Proportional to 1,391,939.48, 1,920,844.78 and 811,126.28

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Solution

The fourth proportional to 1,391,939.48, 1,920,844.78 and 811,126.28 is: 1,119,335.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,939.48 : 1,920,844.78 = 811,126.28 : x
  2. Step 2: Convert to fraction form
    1,391,939.48/1,920,844.78 = 811,126.28/x
  3. Step 3: Cross multiply
    1,391,939.48x = 1,920,844.78 × 811,126.28
  4. Step 4: Simplify right side
    1,391,939.48x = 1,558,047,680,858.82
  5. Step 5: Solve for x
    x = 1,558,047,680,858.82/1,391,939.48
  6. Step 6: Final answer
    x = 1,119,335.79

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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.