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Finding the Fourth Proportional to 641,869.80, 885,808.02 and 355,389.90

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Solution

The fourth proportional to 641,869.80, 885,808.02 and 355,389.90 is: 490,453.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,869.80 : 885,808.02 = 355,389.90 : x
  2. Step 2: Convert to fraction form
    641,869.80/885,808.02 = 355,389.90/x
  3. Step 3: Cross multiply
    641,869.80x = 885,808.02 × 355,389.90
  4. Step 4: Simplify right side
    641,869.80x = 314,807,223,647.00
  5. Step 5: Solve for x
    x = 314,807,223,647.00/641,869.80
  6. Step 6: Final answer
    x = 490,453.40

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1.5x scale

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.