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Finding the Fourth Proportional to 21,873.65, 30,177.86 and 12,919.23

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Solution

The fourth proportional to 21,873.65, 30,177.86 and 12,919.23 is: 17,823.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,873.65 : 30,177.86 = 12,919.23 : x
  2. Step 2: Convert to fraction form
    21,873.65/30,177.86 = 12,919.23/x
  3. Step 3: Cross multiply
    21,873.65x = 30,177.86 × 12,919.23
  4. Step 4: Simplify right side
    21,873.65x = 389,874,649.65
  5. Step 5: Solve for x
    x = 389,874,649.65/21,873.65
  6. Step 6: Final answer
    x = 17,823.95

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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.