Home / 1,383,999.20-1,909,932.72-811,378.40

Finding the Fourth Proportional to 1,383,999.20, 1,909,932.72 and 811,378.40

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Solution

The fourth proportional to 1,383,999.20, 1,909,932.72 and 811,378.40 is: 1,119,710.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383,999.20 : 1,909,932.72 = 811,378.40 : x
  2. Step 2: Convert to fraction form
    1,383,999.20/1,909,932.72 = 811,378.40/x
  3. Step 3: Cross multiply
    1,383,999.20x = 1,909,932.72 × 811,378.40
  4. Step 4: Simplify right side
    1,383,999.20x = 1,549,678,154,461.25
  5. Step 5: Solve for x
    x = 1,549,678,154,461.25/1,383,999.20
  6. Step 6: Final answer
    x = 1,119,710.30

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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.