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Finding the Fourth Proportional to 661,063.20, 990,901.68 and 323,638.56

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Solution

The fourth proportional to 661,063.20, 990,901.68 and 323,638.56 is: 485,118.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,063.20 : 990,901.68 = 323,638.56 : x
  2. Step 2: Convert to fraction form
    661,063.20/990,901.68 = 323,638.56/x
  3. Step 3: Cross multiply
    661,063.20x = 990,901.68 × 323,638.56
  4. Step 4: Simplify right side
    661,063.20x = 320,693,992,816.78
  5. Step 5: Solve for x
    x = 320,693,992,816.78/661,063.20
  6. Step 6: Final answer
    x = 485,118.51

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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.