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Finding the Fourth Proportional to 664,409.80, 996,711.90 and 215,054.20

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Solution

The fourth proportional to 664,409.80, 996,711.90 and 215,054.20 is: 322,612.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,409.80 : 996,711.90 = 215,054.20 : x
  2. Step 2: Convert to fraction form
    664,409.80/996,711.90 = 215,054.20/x
  3. Step 3: Cross multiply
    664,409.80x = 996,711.90 × 215,054.20
  4. Step 4: Simplify right side
    664,409.80x = 214,347,080,284.98
  5. Step 5: Solve for x
    x = 214,347,080,284.98/664,409.80
  6. Step 6: Final answer
    x = 322,612.76

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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.