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Finding the Fourth Proportional to 21,679.60, 32,506.20 and 8,516.20

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Solution

The fourth proportional to 21,679.60, 32,506.20 and 8,516.20 is: 12,769.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.60 : 32,506.20 = 8,516.20 : x
  2. Step 2: Convert to fraction form
    21,679.60/32,506.20 = 8,516.20/x
  3. Step 3: Cross multiply
    21,679.60x = 32,506.20 × 8,516.20
  4. Step 4: Simplify right side
    21,679.60x = 276,829,300.44
  5. Step 5: Solve for x
    x = 276,829,300.44/21,679.60
  6. Step 6: Final answer
    x = 12,769.11

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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.