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Finding the Fourth Proportional to 280,343.20, 420,579.20 and 80,665.24

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Solution

The fourth proportional to 280,343.20, 420,579.20 and 80,665.24 is: 121,016.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,343.20 : 420,579.20 = 80,665.24 : x
  2. Step 2: Convert to fraction form
    280,343.20/420,579.20 = 80,665.24/x
  3. Step 3: Cross multiply
    280,343.20x = 420,579.20 × 80,665.24
  4. Step 4: Simplify right side
    280,343.20x = 33,926,121,703.68
  5. Step 5: Solve for x
    x = 33,926,121,703.68/280,343.20
  6. Step 6: Final answer
    x = 121,016.39

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1.5x scale

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.