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Finding the Fourth Proportional to 20,656.28, 30,978.90 and 8,966.76

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Solution

The fourth proportional to 20,656.28, 30,978.90 and 8,966.76 is: 13,447.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.28 : 30,978.90 = 8,966.76 : x
  2. Step 2: Convert to fraction form
    20,656.28/30,978.90 = 8,966.76/x
  3. Step 3: Cross multiply
    20,656.28x = 30,978.90 × 8,966.76
  4. Step 4: Simplify right side
    20,656.28x = 277,780,361.36
  5. Step 5: Solve for x
    x = 277,780,361.36/20,656.28
  6. Step 6: Final answer
    x = 13,447.74

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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.