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Finding the Fourth Proportional to 393,631.20, 590,504.40 and 206,656.80

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Solution

The fourth proportional to 393,631.20, 590,504.40 and 206,656.80 is: 310,015.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,631.20 : 590,504.40 = 206,656.80 : x
  2. Step 2: Convert to fraction form
    393,631.20/590,504.40 = 206,656.80/x
  3. Step 3: Cross multiply
    393,631.20x = 590,504.40 × 206,656.80
  4. Step 4: Simplify right side
    393,631.20x = 122,031,749,689.92
  5. Step 5: Solve for x
    x = 122,031,749,689.92/393,631.20
  6. Step 6: Final answer
    x = 310,015.44

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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.