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Finding the Fourth Proportional to 18,805.92, 25,943.80 and 12,090.30

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Solution

The fourth proportional to 18,805.92, 25,943.80 and 12,090.30 is: 16,679.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.92 : 25,943.80 = 12,090.30 : x
  2. Step 2: Convert to fraction form
    18,805.92/25,943.80 = 12,090.30/x
  3. Step 3: Cross multiply
    18,805.92x = 25,943.80 × 12,090.30
  4. Step 4: Simplify right side
    18,805.92x = 313,668,325.14
  5. Step 5: Solve for x
    x = 313,668,325.14/18,805.92
  6. Step 6: Final answer
    x = 16,679.23

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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.