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Finding the Fourth Proportional to 661,640.43, 992,589.87 and 212,326.75

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Solution

The fourth proportional to 661,640.43, 992,589.87 and 212,326.75 is: 318,531.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,640.43 : 992,589.87 = 212,326.75 : x
  2. Step 2: Convert to fraction form
    661,640.43/992,589.87 = 212,326.75/x
  3. Step 3: Cross multiply
    661,640.43x = 992,589.87 × 212,326.75
  4. Step 4: Simplify right side
    661,640.43x = 210,753,381,180.02
  5. Step 5: Solve for x
    x = 210,753,381,180.02/661,640.43
  6. Step 6: Final answer
    x = 318,531.59

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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.