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Finding the Fourth Proportional to 21,807.80, 32,725.20 and 8,658.80

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Solution

The fourth proportional to 21,807.80, 32,725.20 and 8,658.80 is: 12,993.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,807.80 : 32,725.20 = 8,658.80 : x
  2. Step 2: Convert to fraction form
    21,807.80/32,725.20 = 8,658.80/x
  3. Step 3: Cross multiply
    21,807.80x = 32,725.20 × 8,658.80
  4. Step 4: Simplify right side
    21,807.80x = 283,360,961.76
  5. Step 5: Solve for x
    x = 283,360,961.76/21,807.80
  6. Step 6: Final answer
    x = 12,993.56

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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.