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Finding the Fourth Proportional to 18,862.99, 28,293.09 and 7,619.11

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Solution

The fourth proportional to 18,862.99, 28,293.09 and 7,619.11 is: 11,428.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,862.99 : 28,293.09 = 7,619.11 : x
  2. Step 2: Convert to fraction form
    18,862.99/28,293.09 = 7,619.11/x
  3. Step 3: Cross multiply
    18,862.99x = 28,293.09 × 7,619.11
  4. Step 4: Simplify right side
    18,862.99x = 215,568,065.65
  5. Step 5: Solve for x
    x = 215,568,065.65/18,862.99
  6. Step 6: Final answer
    x = 11,428.10

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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.