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Finding the Fourth Proportional to 18,990.72, 28,467.18 and 7,890.48

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Solution

The fourth proportional to 18,990.72, 28,467.18 and 7,890.48 is: 11,827.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.72 : 28,467.18 = 7,890.48 : x
  2. Step 2: Convert to fraction form
    18,990.72/28,467.18 = 7,890.48/x
  3. Step 3: Cross multiply
    18,990.72x = 28,467.18 × 7,890.48
  4. Step 4: Simplify right side
    18,990.72x = 224,619,714.45
  5. Step 5: Solve for x
    x = 224,619,714.45/18,990.72
  6. Step 6: Final answer
    x = 11,827.87

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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.