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Finding the Fourth Proportional to 28,856.51, 39,815.11 and 19,901.15

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Solution

The fourth proportional to 28,856.51, 39,815.11 and 19,901.15 is: 27,458.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,856.51 : 39,815.11 = 19,901.15 : x
  2. Step 2: Convert to fraction form
    28,856.51/39,815.11 = 19,901.15/x
  3. Step 3: Cross multiply
    28,856.51x = 39,815.11 × 19,901.15
  4. Step 4: Simplify right side
    28,856.51x = 792,366,476.38
  5. Step 5: Solve for x
    x = 792,366,476.38/28,856.51
  6. Step 6: Final answer
    x = 27,458.85

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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.