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Finding the Fourth Proportional to 619,618.40, 855,618.66 and 387,443.24

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Solution

The fourth proportional to 619,618.40, 855,618.66 and 387,443.24 is: 535,012.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,618.40 : 855,618.66 = 387,443.24 : x
  2. Step 2: Convert to fraction form
    619,618.40/855,618.66 = 387,443.24/x
  3. Step 3: Cross multiply
    619,618.40x = 855,618.66 × 387,443.24
  4. Step 4: Simplify right side
    619,618.40x = 331,503,665,834.86
  5. Step 5: Solve for x
    x = 331,503,665,834.86/619,618.40
  6. Step 6: Final answer
    x = 535,012.62

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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.