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Finding the Fourth Proportional to 18,991.32, 28,497.24 and 7,905.66

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Solution

The fourth proportional to 18,991.32, 28,497.24 and 7,905.66 is: 11,862.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.32 : 28,497.24 = 7,905.66 : x
  2. Step 2: Convert to fraction form
    18,991.32/28,497.24 = 7,905.66/x
  3. Step 3: Cross multiply
    18,991.32x = 28,497.24 × 7,905.66
  4. Step 4: Simplify right side
    18,991.32x = 225,289,490.38
  5. Step 5: Solve for x
    x = 225,289,490.38/18,991.32
  6. Step 6: Final answer
    x = 11,862.76

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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.