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Finding the Fourth Proportional to 18,808.19, 28,223.21 and 7,722.83

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Solution

The fourth proportional to 18,808.19, 28,223.21 and 7,722.83 is: 11,588.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,808.19 : 28,223.21 = 7,722.83 : x
  2. Step 2: Convert to fraction form
    18,808.19/28,223.21 = 7,722.83/x
  3. Step 3: Cross multiply
    18,808.19x = 28,223.21 × 7,722.83
  4. Step 4: Simplify right side
    18,808.19x = 217,962,873.15
  5. Step 5: Solve for x
    x = 217,962,873.15/18,808.19
  6. Step 6: Final answer
    x = 11,588.72

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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.