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Finding the Fourth Proportional to 620,865.91, 856,444.39 and 391,028.26

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Solution

The fourth proportional to 620,865.91, 856,444.39 and 391,028.26 is: 539,398.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,865.91 : 856,444.39 = 391,028.26 : x
  2. Step 2: Convert to fraction form
    620,865.91/856,444.39 = 391,028.26/x
  3. Step 3: Cross multiply
    620,865.91x = 856,444.39 × 391,028.26
  4. Step 4: Simplify right side
    620,865.91x = 334,893,959,608.46
  5. Step 5: Solve for x
    x = 334,893,959,608.46/620,865.91
  6. Step 6: Final answer
    x = 539,398.21

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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.