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Finding the Fourth Proportional to 621,686.92, 857,851.29 and 392,157.58

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Solution

The fourth proportional to 621,686.92, 857,851.29 and 392,157.58 is: 541,129.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,686.92 : 857,851.29 = 392,157.58 : x
  2. Step 2: Convert to fraction form
    621,686.92/857,851.29 = 392,157.58/x
  3. Step 3: Cross multiply
    621,686.92x = 857,851.29 × 392,157.58
  4. Step 4: Simplify right side
    621,686.92x = 336,412,885,886.28
  5. Step 5: Solve for x
    x = 336,412,885,886.28/621,686.92
  6. Step 6: Final answer
    x = 541,129.10

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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.