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Finding the Fourth Proportional to 18,666.99, 28,000.49 and 12,805.83

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Solution

The fourth proportional to 18,666.99, 28,000.49 and 12,805.83 is: 19,208.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.99 : 28,000.49 = 12,805.83 : x
  2. Step 2: Convert to fraction form
    18,666.99/28,000.49 = 12,805.83/x
  3. Step 3: Cross multiply
    18,666.99x = 28,000.49 × 12,805.83
  4. Step 4: Simplify right side
    18,666.99x = 358,569,450.83
  5. Step 5: Solve for x
    x = 358,569,450.83/18,666.99
  6. Step 6: Final answer
    x = 19,208.75

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.