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Finding the Fourth Proportional to 20,755.80, 28,698.30 and 18,131.40

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Solution

The fourth proportional to 20,755.80, 28,698.30 and 18,131.40 is: 25,069.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,755.80 : 28,698.30 = 18,131.40 : x
  2. Step 2: Convert to fraction form
    20,755.80/28,698.30 = 18,131.40/x
  3. Step 3: Cross multiply
    20,755.80x = 28,698.30 × 18,131.40
  4. Step 4: Simplify right side
    20,755.80x = 520,340,356.62
  5. Step 5: Solve for x
    x = 520,340,356.62/20,755.80
  6. Step 6: Final answer
    x = 25,069.64

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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.