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Finding the Fourth Proportional to 18,969.80, 28,446.80 and 6,487.29

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Solution

The fourth proportional to 18,969.80, 28,446.80 and 6,487.29 is: 9,728.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.80 : 28,446.80 = 6,487.29 : x
  2. Step 2: Convert to fraction form
    18,969.80/28,446.80 = 6,487.29/x
  3. Step 3: Cross multiply
    18,969.80x = 28,446.80 × 6,487.29
  4. Step 4: Simplify right side
    18,969.80x = 184,542,608.74
  5. Step 5: Solve for x
    x = 184,542,608.74/18,969.80
  6. Step 6: Final answer
    x = 9,728.23

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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.