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Finding the Fourth Proportional to 18,803.80, 25,949.19 and 10,420.30

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Solution

The fourth proportional to 18,803.80, 25,949.19 and 10,420.30 is: 14,379.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,803.80 : 25,949.19 = 10,420.30 : x
  2. Step 2: Convert to fraction form
    18,803.80/25,949.19 = 10,420.30/x
  3. Step 3: Cross multiply
    18,803.80x = 25,949.19 × 10,420.30
  4. Step 4: Simplify right side
    18,803.80x = 270,398,344.56
  5. Step 5: Solve for x
    x = 270,398,344.56/18,803.80
  6. Step 6: Final answer
    x = 14,379.98

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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.