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Finding the Fourth Proportional to 1,209,793.71, 1,669,502.61 and 665,917.86

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Solution

The fourth proportional to 1,209,793.71, 1,669,502.61 and 665,917.86 is: 918,959.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209,793.71 : 1,669,502.61 = 665,917.86 : x
  2. Step 2: Convert to fraction form
    1,209,793.71/1,669,502.61 = 665,917.86/x
  3. Step 3: Cross multiply
    1,209,793.71x = 1,669,502.61 × 665,917.86
  4. Step 4: Simplify right side
    1,209,793.71x = 1,111,751,605,315.61
  5. Step 5: Solve for x
    x = 1,111,751,605,315.61/1,209,793.71
  6. Step 6: Final answer
    x = 918,959.65

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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.