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Finding the Fourth Proportional to 641,368.28, 885,360.84 and 399,771.20

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Solution

The fourth proportional to 641,368.28, 885,360.84 and 399,771.20 is: 551,854.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,368.28 : 885,360.84 = 399,771.20 : x
  2. Step 2: Convert to fraction form
    641,368.28/885,360.84 = 399,771.20/x
  3. Step 3: Cross multiply
    641,368.28x = 885,360.84 × 399,771.20
  4. Step 4: Simplify right side
    641,368.28x = 353,941,765,439.81
  5. Step 5: Solve for x
    x = 353,941,765,439.81/641,368.28
  6. Step 6: Final answer
    x = 551,854.18

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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.