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Finding the Fourth Proportional to 660,713.20, 991,069.80 and 394,992.70

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Solution

The fourth proportional to 660,713.20, 991,069.80 and 394,992.70 is: 592,489.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,713.20 : 991,069.80 = 394,992.70 : x
  2. Step 2: Convert to fraction form
    660,713.20/991,069.80 = 394,992.70/x
  3. Step 3: Cross multiply
    660,713.20x = 991,069.80 × 394,992.70
  4. Step 4: Simplify right side
    660,713.20x = 391,465,336,190.46
  5. Step 5: Solve for x
    x = 391,465,336,190.46/660,713.20
  6. Step 6: Final answer
    x = 592,489.05

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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.