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Finding the Fourth Proportional to 20,555.81, 30,821.74 and 8,061.19

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Solution

The fourth proportional to 20,555.81, 30,821.74 and 8,061.19 is: 12,087.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.81 : 30,821.74 = 8,061.19 : x
  2. Step 2: Convert to fraction form
    20,555.81/30,821.74 = 8,061.19/x
  3. Step 3: Cross multiply
    20,555.81x = 30,821.74 × 8,061.19
  4. Step 4: Simplify right side
    20,555.81x = 248,459,902.27
  5. Step 5: Solve for x
    x = 248,459,902.27/20,555.81
  6. Step 6: Final answer
    x = 12,087.09

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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.