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Finding the Fourth Proportional to 21,815.20, 32,706.60 and 8,660.80

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Solution

The fourth proportional to 21,815.20, 32,706.60 and 8,660.80 is: 12,984.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.20 : 32,706.60 = 8,660.80 : x
  2. Step 2: Convert to fraction form
    21,815.20/32,706.60 = 8,660.80/x
  3. Step 3: Cross multiply
    21,815.20x = 32,706.60 × 8,660.80
  4. Step 4: Simplify right side
    21,815.20x = 283,265,321.28
  5. Step 5: Solve for x
    x = 283,265,321.28/21,815.20
  6. Step 6: Final answer
    x = 12,984.77

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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.