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Finding the Fourth Proportional to 641,711.87, 885,568.93 and 355,225.80

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Solution

The fourth proportional to 641,711.87, 885,568.93 and 355,225.80 is: 490,215.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,711.87 : 885,568.93 = 355,225.80 : x
  2. Step 2: Convert to fraction form
    641,711.87/885,568.93 = 355,225.80/x
  3. Step 3: Cross multiply
    641,711.87x = 885,568.93 × 355,225.80
  4. Step 4: Simplify right side
    641,711.87x = 314,576,931,614.39
  5. Step 5: Solve for x
    x = 314,576,931,614.39/641,711.87
  6. Step 6: Final answer
    x = 490,215.23

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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.