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Finding the Fourth Proportional to 68,532.80, 102,799.20 and 21,790.40

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Solution

The fourth proportional to 68,532.80, 102,799.20 and 21,790.40 is: 32,685.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,532.80 : 102,799.20 = 21,790.40 : x
  2. Step 2: Convert to fraction form
    68,532.80/102,799.20 = 21,790.40/x
  3. Step 3: Cross multiply
    68,532.80x = 102,799.20 × 21,790.40
  4. Step 4: Simplify right side
    68,532.80x = 2,240,035,687.68
  5. Step 5: Solve for x
    x = 2,240,035,687.68/68,532.80
  6. Step 6: Final answer
    x = 32,685.60

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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.