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Finding the Fourth Proportional to 420,800.90, 580,705.89 and 239,512.83

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Solution

The fourth proportional to 420,800.90, 580,705.89 and 239,512.83 is: 330,528.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,800.90 : 580,705.89 = 239,512.83 : x
  2. Step 2: Convert to fraction form
    420,800.90/580,705.89 = 239,512.83/x
  3. Step 3: Cross multiply
    420,800.90x = 580,705.89 × 239,512.83
  4. Step 4: Simplify right side
    420,800.90x = 139,086,508,933.92
  5. Step 5: Solve for x
    x = 139,086,508,933.92/420,800.90
  6. Step 6: Final answer
    x = 330,528.07

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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.