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Finding the Fourth Proportional to 621,694.02, 857,861.64 and 392,165.13

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Solution

The fourth proportional to 621,694.02, 857,861.64 and 392,165.13 is: 541,139.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,694.02 : 857,861.64 = 392,165.13 : x
  2. Step 2: Convert to fraction form
    621,694.02/857,861.64 = 392,165.13/x
  3. Step 3: Cross multiply
    621,694.02x = 857,861.64 × 392,165.13
  4. Step 4: Simplify right side
    621,694.02x = 336,423,421,572.61
  5. Step 5: Solve for x
    x = 336,423,421,572.61/621,694.02
  6. Step 6: Final answer
    x = 541,139.87

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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.