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Finding the Fourth Proportional to 621,685.92, 857,849.91 and 392,156.58

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Solution

The fourth proportional to 621,685.92, 857,849.91 and 392,156.58 is: 541,127.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,685.92 : 857,849.91 = 392,156.58 : x
  2. Step 2: Convert to fraction form
    621,685.92/857,849.91 = 392,156.58/x
  3. Step 3: Cross multiply
    621,685.92x = 857,849.91 × 392,156.58
  4. Step 4: Simplify right side
    621,685.92x = 336,411,486,858.91
  5. Step 5: Solve for x
    x = 336,411,486,858.91/621,685.92
  6. Step 6: Final answer
    x = 541,127.72

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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.