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Finding the Fourth Proportional to 21,778.80, 32,672.60 and 8,631.64

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Solution

The fourth proportional to 21,778.80, 32,672.60 and 8,631.64 is: 12,949.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,778.80 : 32,672.60 = 8,631.64 : x
  2. Step 2: Convert to fraction form
    21,778.80/32,672.60 = 8,631.64/x
  3. Step 3: Cross multiply
    21,778.80x = 32,672.60 × 8,631.64
  4. Step 4: Simplify right side
    21,778.80x = 282,018,121.06
  5. Step 5: Solve for x
    x = 282,018,121.06/21,778.80
  6. Step 6: Final answer
    x = 12,949.20

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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.