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Finding the Fourth Proportional to 18,871.42, 28,307.12 and 8,471.02

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Solution

The fourth proportional to 18,871.42, 28,307.12 and 8,471.02 is: 12,706.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.42 : 28,307.12 = 8,471.02 : x
  2. Step 2: Convert to fraction form
    18,871.42/28,307.12 = 8,471.02/x
  3. Step 3: Cross multiply
    18,871.42x = 28,307.12 × 8,471.02
  4. Step 4: Simplify right side
    18,871.42x = 239,790,179.66
  5. Step 5: Solve for x
    x = 239,790,179.66/18,871.42
  6. Step 6: Final answer
    x = 12,706.53

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Similar ratio
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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.