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Finding the Fourth Proportional to 80,639.70, 120,799.86 and 55,276.80

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Solution

The fourth proportional to 80,639.70, 120,799.86 and 55,276.80 is: 82,805.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,639.70 : 120,799.86 = 55,276.80 : x
  2. Step 2: Convert to fraction form
    80,639.70/120,799.86 = 55,276.80/x
  3. Step 3: Cross multiply
    80,639.70x = 120,799.86 × 55,276.80
  4. Step 4: Simplify right side
    80,639.70x = 6,677,429,701.25
  5. Step 5: Solve for x
    x = 6,677,429,701.25/80,639.70
  6. Step 6: Final answer
    x = 82,805.74

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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.