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Finding the Fourth Proportional to 18,703.80, 25,811.78 and 10,320.84

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Solution

The fourth proportional to 18,703.80, 25,811.78 and 10,320.84 is: 14,243.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,703.80 : 25,811.78 = 10,320.84 : x
  2. Step 2: Convert to fraction form
    18,703.80/25,811.78 = 10,320.84/x
  3. Step 3: Cross multiply
    18,703.80x = 25,811.78 × 10,320.84
  4. Step 4: Simplify right side
    18,703.80x = 266,399,251.50
  5. Step 5: Solve for x
    x = 266,399,251.50/18,703.80
  6. Step 6: Final answer
    x = 14,243.05

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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.