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Finding the Fourth Proportional to 641,718.40, 885,293.40 and 386,928.04

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Solution

The fourth proportional to 641,718.40, 885,293.40 and 386,928.04 is: 533,793.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,718.40 : 885,293.40 = 386,928.04 : x
  2. Step 2: Convert to fraction form
    641,718.40/885,293.40 = 386,928.04/x
  3. Step 3: Cross multiply
    641,718.40x = 885,293.40 × 386,928.04
  4. Step 4: Simplify right side
    641,718.40x = 342,544,840,086.94
  5. Step 5: Solve for x
    x = 342,544,840,086.94/641,718.40
  6. Step 6: Final answer
    x = 533,793.08

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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.