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Finding the Fourth Proportional to 12,487.76, 18,719.80 and 4,274

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Solution

The fourth proportional to 12,487.76, 18,719.80 and 4,274 is: 6,406.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.76 : 18,719.80 = 4,274 : x
  2. Step 2: Convert to fraction form
    12,487.76/18,719.80 = 4,274/x
  3. Step 3: Cross multiply
    12,487.76x = 18,719.80 × 4,274
  4. Step 4: Simplify right side
    12,487.76x = 80,008,425.20
  5. Step 5: Solve for x
    x = 80,008,425.20/12,487.76
  6. Step 6: Final answer
    x = 6,406.95

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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.