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Finding the Fourth Proportional to 621,572.20, 857,459.10 and 392,413.48

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Solution

The fourth proportional to 621,572.20, 857,459.10 and 392,413.48 is: 541,334.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,572.20 : 857,459.10 = 392,413.48 : x
  2. Step 2: Convert to fraction form
    621,572.20/857,459.10 = 392,413.48/x
  3. Step 3: Cross multiply
    621,572.20x = 857,459.10 × 392,413.48
  4. Step 4: Simplify right side
    621,572.20x = 336,478,509,388.67
  5. Step 5: Solve for x
    x = 336,478,509,388.67/621,572.20
  6. Step 6: Final answer
    x = 541,334.55

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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.