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Finding the Fourth Proportional to 391,695, 540,542.52 and 212,847

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Solution

The fourth proportional to 391,695, 540,542.52 and 212,847 is: 293,730.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,695 : 540,542.52 = 212,847 : x
  2. Step 2: Convert to fraction form
    391,695/540,542.52 = 212,847/x
  3. Step 3: Cross multiply
    391,695x = 540,542.52 × 212,847
  4. Step 4: Simplify right side
    391,695x = 115,052,853,754.44
  5. Step 5: Solve for x
    x = 115,052,853,754.44/391,695
  6. Step 6: Final answer
    x = 293,730.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.