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Finding the Fourth Proportional to 420,993.99, 580,972.28 and 239,706

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Solution

The fourth proportional to 420,993.99, 580,972.28 and 239,706 is: 330,794.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,993.99 : 580,972.28 = 239,706 : x
  2. Step 2: Convert to fraction form
    420,993.99/580,972.28 = 239,706/x
  3. Step 3: Cross multiply
    420,993.99x = 580,972.28 × 239,706
  4. Step 4: Simplify right side
    420,993.99x = 139,262,540,151.15
  5. Step 5: Solve for x
    x = 139,262,540,151.15/420,993.99
  6. Step 6: Final answer
    x = 330,794.60

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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.