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Finding the Fourth Proportional to 280,343.70, 420,579.95 and 80,665.74

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Solution

The fourth proportional to 280,343.70, 420,579.95 and 80,665.74 is: 121,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,343.70 : 420,579.95 = 80,665.74 : x
  2. Step 2: Convert to fraction form
    280,343.70/420,579.95 = 80,665.74/x
  3. Step 3: Cross multiply
    280,343.70x = 420,579.95 × 80,665.74
  4. Step 4: Simplify right side
    280,343.70x = 33,926,392,895.91
  5. Step 5: Solve for x
    x = 33,926,392,895.91/280,343.70
  6. Step 6: Final answer
    x = 121,017.14

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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.