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Finding the Fourth Proportional to 420,579.42, 630,398.87 and 220,920.90

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Solution

The fourth proportional to 420,579.42, 630,398.87 and 220,920.90 is: 331,134.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,579.42 : 630,398.87 = 220,920.90 : x
  2. Step 2: Convert to fraction form
    420,579.42/630,398.87 = 220,920.90/x
  3. Step 3: Cross multiply
    420,579.42x = 630,398.87 × 220,920.90
  4. Step 4: Simplify right side
    420,579.42x = 139,268,284,614.78
  5. Step 5: Solve for x
    x = 139,268,284,614.78/420,579.42
  6. Step 6: Final answer
    x = 331,134.33

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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.