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Finding the Fourth Proportional to 280,398.76, 420,535.26 and 80,674.60

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Solution

The fourth proportional to 280,398.76, 420,535.26 and 80,674.60 is: 120,993.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,398.76 : 420,535.26 = 80,674.60 : x
  2. Step 2: Convert to fraction form
    280,398.76/420,535.26 = 80,674.60/x
  3. Step 3: Cross multiply
    280,398.76x = 420,535.26 × 80,674.60
  4. Step 4: Simplify right side
    280,398.76x = 33,926,513,886.40
  5. Step 5: Solve for x
    x = 33,926,513,886.40/280,398.76
  6. Step 6: Final answer
    x = 120,993.81

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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.