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Finding the Fourth Proportional to 18,978.56, 28,472.56 and 7,881.92

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Solution

The fourth proportional to 18,978.56, 28,472.56 and 7,881.92 is: 11,824.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.56 : 28,472.56 = 7,881.92 : x
  2. Step 2: Convert to fraction form
    18,978.56/28,472.56 = 7,881.92/x
  3. Step 3: Cross multiply
    18,978.56x = 28,472.56 × 7,881.92
  4. Step 4: Simplify right side
    18,978.56x = 224,418,440.12
  5. Step 5: Solve for x
    x = 224,418,440.12/18,978.56
  6. Step 6: Final answer
    x = 11,824.84

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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.