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Finding the Fourth Proportional to 309,483.12, 427,162.68 and 188,691

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Solution

The fourth proportional to 309,483.12, 427,162.68 and 188,691 is: 260,439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,483.12 : 427,162.68 = 188,691 : x
  2. Step 2: Convert to fraction form
    309,483.12/427,162.68 = 188,691/x
  3. Step 3: Cross multiply
    309,483.12x = 427,162.68 × 188,691
  4. Step 4: Simplify right side
    309,483.12x = 80,601,753,251.88
  5. Step 5: Solve for x
    x = 80,601,753,251.88/309,483.12
  6. Step 6: Final answer
    x = 260,439.90

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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.