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Finding the Fourth Proportional to 18,195.12, 25,111.80 and 15,206.16

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Solution

The fourth proportional to 18,195.12, 25,111.80 and 15,206.16 is: 20,986.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,195.12 : 25,111.80 = 15,206.16 : x
  2. Step 2: Convert to fraction form
    18,195.12/25,111.80 = 15,206.16/x
  3. Step 3: Cross multiply
    18,195.12x = 25,111.80 × 15,206.16
  4. Step 4: Simplify right side
    18,195.12x = 381,854,048.69
  5. Step 5: Solve for x
    x = 381,854,048.69/18,195.12
  6. Step 6: Final answer
    x = 20,986.62

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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.