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Finding the Fourth Proportional to 621,164.49, 857,201.90 and 391,869.89

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Solution

The fourth proportional to 621,164.49, 857,201.90 and 391,869.89 is: 540,777.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,164.49 : 857,201.90 = 391,869.89 : x
  2. Step 2: Convert to fraction form
    621,164.49/857,201.90 = 391,869.89/x
  3. Step 3: Cross multiply
    621,164.49x = 857,201.90 × 391,869.89
  4. Step 4: Simplify right side
    621,164.49x = 335,911,614,260.79
  5. Step 5: Solve for x
    x = 335,911,614,260.79/621,164.49
  6. Step 6: Final answer
    x = 540,777.23

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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.