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Finding the Fourth Proportional to 199,990.78, 300,002.13 and 66,871.73

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Solution

The fourth proportional to 199,990.78, 300,002.13 and 66,871.73 is: 100,312.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,990.78 : 300,002.13 = 66,871.73 : x
  2. Step 2: Convert to fraction form
    199,990.78/300,002.13 = 66,871.73/x
  3. Step 3: Cross multiply
    199,990.78x = 300,002.13 × 66,871.73
  4. Step 4: Simplify right side
    199,990.78x = 20,061,662,186.79
  5. Step 5: Solve for x
    x = 20,061,662,186.79/199,990.78
  6. Step 6: Final answer
    x = 100,312.94

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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.