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Finding the Fourth Proportional to 420,605.86, 580,469.22 and 239,325.43

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Solution

The fourth proportional to 420,605.86, 580,469.22 and 239,325.43 is: 330,287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,605.86 : 580,469.22 = 239,325.43 : x
  2. Step 2: Convert to fraction form
    420,605.86/580,469.22 = 239,325.43/x
  3. Step 3: Cross multiply
    420,605.86x = 580,469.22 × 239,325.43
  4. Step 4: Simplify right side
    420,605.86x = 138,921,045,678.27
  5. Step 5: Solve for x
    x = 138,921,045,678.27/420,605.86
  6. Step 6: Final answer
    x = 330,287.95

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1.5x scale

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.