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Finding the Fourth Proportional to 420,983.28, 580,956.84 and 239,685.84

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Solution

The fourth proportional to 420,983.28, 580,956.84 and 239,685.84 is: 330,766.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,983.28 : 580,956.84 = 239,685.84 : x
  2. Step 2: Convert to fraction form
    420,983.28/580,956.84 = 239,685.84/x
  3. Step 3: Cross multiply
    420,983.28x = 580,956.84 × 239,685.84
  4. Step 4: Simplify right side
    420,983.28x = 139,247,128,199.15
  5. Step 5: Solve for x
    x = 139,247,128,199.15/420,983.28
  6. Step 6: Final answer
    x = 330,766.41

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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.