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Finding the Fourth Proportional to 259,815.20, 389,722.80 and 207,327.20

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Solution

The fourth proportional to 259,815.20, 389,722.80 and 207,327.20 is: 310,990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,815.20 : 389,722.80 = 207,327.20 : x
  2. Step 2: Convert to fraction form
    259,815.20/389,722.80 = 207,327.20/x
  3. Step 3: Cross multiply
    259,815.20x = 389,722.80 × 207,327.20
  4. Step 4: Simplify right side
    259,815.20x = 80,800,136,900.16
  5. Step 5: Solve for x
    x = 80,800,136,900.16/259,815.20
  6. Step 6: Final answer
    x = 310,990.80

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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.