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Finding the Fourth Proportional to 85,836.80, 128,727.54 and 80,239.46

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Solution

The fourth proportional to 85,836.80, 128,727.54 and 80,239.46 is: 120,333.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,836.80 : 128,727.54 = 80,239.46 : x
  2. Step 2: Convert to fraction form
    85,836.80/128,727.54 = 80,239.46/x
  3. Step 3: Cross multiply
    85,836.80x = 128,727.54 × 80,239.46
  4. Step 4: Simplify right side
    85,836.80x = 10,329,028,296.73
  5. Step 5: Solve for x
    x = 10,329,028,296.73/85,836.80
  6. Step 6: Final answer
    x = 120,333.33

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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.