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Finding the Fourth Proportional to 18,979.34, 28,472.06 and 7,134.02

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Solution

The fourth proportional to 18,979.34, 28,472.06 and 7,134.02 is: 10,702.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.34 : 28,472.06 = 7,134.02 : x
  2. Step 2: Convert to fraction form
    18,979.34/28,472.06 = 7,134.02/x
  3. Step 3: Cross multiply
    18,979.34x = 28,472.06 × 7,134.02
  4. Step 4: Simplify right side
    18,979.34x = 203,120,245.48
  5. Step 5: Solve for x
    x = 203,120,245.48/18,979.34
  6. Step 6: Final answer
    x = 10,702.18

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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.