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Finding the Fourth Proportional to 279,816.40, 419,724.60 and 161,426.80

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Solution

The fourth proportional to 279,816.40, 419,724.60 and 161,426.80 is: 242,140.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,816.40 : 419,724.60 = 161,426.80 : x
  2. Step 2: Convert to fraction form
    279,816.40/419,724.60 = 161,426.80/x
  3. Step 3: Cross multiply
    279,816.40x = 419,724.60 × 161,426.80
  4. Step 4: Simplify right side
    279,816.40x = 67,754,799,059.28
  5. Step 5: Solve for x
    x = 67,754,799,059.28/279,816.40
  6. Step 6: Final answer
    x = 242,140.20

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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.