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Finding the Fourth Proportional to 28,000.78, 38,643.84 and 20,914.90

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Solution

The fourth proportional to 28,000.78, 38,643.84 and 20,914.90 is: 28,864.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.78 : 38,643.84 = 20,914.90 : x
  2. Step 2: Convert to fraction form
    28,000.78/38,643.84 = 20,914.90/x
  3. Step 3: Cross multiply
    28,000.78x = 38,643.84 × 20,914.90
  4. Step 4: Simplify right side
    28,000.78x = 808,232,049.22
  5. Step 5: Solve for x
    x = 808,232,049.22/28,000.78
  6. Step 6: Final answer
    x = 28,864.63

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Double scale
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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.