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Finding the Fourth Proportional to 18,785.17, 25,881.80 and 12,400.39

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Solution

The fourth proportional to 18,785.17, 25,881.80 and 12,400.39 is: 17,084.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,785.17 : 25,881.80 = 12,400.39 : x
  2. Step 2: Convert to fraction form
    18,785.17/25,881.80 = 12,400.39/x
  3. Step 3: Cross multiply
    18,785.17x = 25,881.80 × 12,400.39
  4. Step 4: Simplify right side
    18,785.17x = 320,944,413.90
  5. Step 5: Solve for x
    x = 320,944,413.90/18,785.17
  6. Step 6: Final answer
    x = 17,084.99

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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.