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Finding the Fourth Proportional to 641,868.34, 885,805.96 and 355,388.40

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Solution

The fourth proportional to 641,868.34, 885,805.96 and 355,388.40 is: 490,451.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,868.34 : 885,805.96 = 355,388.40 : x
  2. Step 2: Convert to fraction form
    641,868.34/885,805.96 = 355,388.40/x
  3. Step 3: Cross multiply
    641,868.34x = 885,805.96 × 355,388.40
  4. Step 4: Simplify right side
    641,868.34x = 314,805,162,834.86
  5. Step 5: Solve for x
    x = 314,805,162,834.86/641,868.34
  6. Step 6: Final answer
    x = 490,451.30

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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.