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Finding the Fourth Proportional to 18,705.20, 28,057.79 and 7,010.21

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Solution

The fourth proportional to 18,705.20, 28,057.79 and 7,010.21 is: 10,515.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.20 : 28,057.79 = 7,010.21 : x
  2. Step 2: Convert to fraction form
    18,705.20/28,057.79 = 7,010.21/x
  3. Step 3: Cross multiply
    18,705.20x = 28,057.79 × 7,010.21
  4. Step 4: Simplify right side
    18,705.20x = 196,690,824.70
  5. Step 5: Solve for x
    x = 196,690,824.70/18,705.20
  6. Step 6: Final answer
    x = 10,515.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.