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Finding the Fourth Proportional to 18,820.87, 28,230.42 and 7,724.81

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Solution

The fourth proportional to 18,820.87, 28,230.42 and 7,724.81 is: 11,586.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,820.87 : 28,230.42 = 7,724.81 : x
  2. Step 2: Convert to fraction form
    18,820.87/28,230.42 = 7,724.81/x
  3. Step 3: Cross multiply
    18,820.87x = 28,230.42 × 7,724.81
  4. Step 4: Simplify right side
    18,820.87x = 218,074,630.72
  5. Step 5: Solve for x
    x = 218,074,630.72/18,820.87
  6. Step 6: Final answer
    x = 11,586.85

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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.