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Finding the Fourth Proportional to 257,631.80, 386,447.70 and 68,091.80

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Solution

The fourth proportional to 257,631.80, 386,447.70 and 68,091.80 is: 102,137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,631.80 : 386,447.70 = 68,091.80 : x
  2. Step 2: Convert to fraction form
    257,631.80/386,447.70 = 68,091.80/x
  3. Step 3: Cross multiply
    257,631.80x = 386,447.70 × 68,091.80
  4. Step 4: Simplify right side
    257,631.80x = 26,313,919,498.86
  5. Step 5: Solve for x
    x = 26,313,919,498.86/257,631.80
  6. Step 6: Final answer
    x = 102,137.70

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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.