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Finding the Fourth Proportional to 68,211.72, 102,303 and 20,816.19

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Solution

The fourth proportional to 68,211.72, 102,303 and 20,816.19 is: 31,219.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,211.72 : 102,303 = 20,816.19 : x
  2. Step 2: Convert to fraction form
    68,211.72/102,303 = 20,816.19/x
  3. Step 3: Cross multiply
    68,211.72x = 102,303 × 20,816.19
  4. Step 4: Simplify right side
    68,211.72x = 2,129,558,685.57
  5. Step 5: Solve for x
    x = 2,129,558,685.57/68,211.72
  6. Step 6: Final answer
    x = 31,219.84

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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.