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Finding the Fourth Proportional to 18,691.79, 28,053.86 and 9,813.38

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Solution

The fourth proportional to 18,691.79, 28,053.86 and 9,813.38 is: 14,728.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.79 : 28,053.86 = 9,813.38 : x
  2. Step 2: Convert to fraction form
    18,691.79/28,053.86 = 9,813.38/x
  3. Step 3: Cross multiply
    18,691.79x = 28,053.86 × 9,813.38
  4. Step 4: Simplify right side
    18,691.79x = 275,303,269.54
  5. Step 5: Solve for x
    x = 275,303,269.54/18,691.79
  6. Step 6: Final answer
    x = 14,728.57

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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.