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Finding the Fourth Proportional to 81,808.20, 122,712.30 and 67,033.80

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Solution

The fourth proportional to 81,808.20, 122,712.30 and 67,033.80 is: 100,550.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,808.20 : 122,712.30 = 67,033.80 : x
  2. Step 2: Convert to fraction form
    81,808.20/122,712.30 = 67,033.80/x
  3. Step 3: Cross multiply
    81,808.20x = 122,712.30 × 67,033.80
  4. Step 4: Simplify right side
    81,808.20x = 8,225,871,775.74
  5. Step 5: Solve for x
    x = 8,225,871,775.74/81,808.20
  6. Step 6: Final answer
    x = 100,550.70

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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.