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Finding the Fourth Proportional to 420,358.86, 630,874.56 and 220,796.94

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Solution

The fourth proportional to 420,358.86, 630,874.56 and 220,796.94 is: 331,372.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,358.86 : 630,874.56 = 220,796.94 : x
  2. Step 2: Convert to fraction form
    420,358.86/630,874.56 = 220,796.94/x
  3. Step 3: Cross multiply
    420,358.86x = 630,874.56 × 220,796.94
  4. Step 4: Simplify right side
    420,358.86x = 139,295,172,371.85
  5. Step 5: Solve for x
    x = 139,295,172,371.85/420,358.86
  6. Step 6: Final answer
    x = 331,372.04

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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.