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Finding the Fourth Proportional to 18,982.76, 28,474.07 and 5,131.76

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Solution

The fourth proportional to 18,982.76, 28,474.07 and 5,131.76 is: 7,697.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,982.76 : 28,474.07 = 5,131.76 : x
  2. Step 2: Convert to fraction form
    18,982.76/28,474.07 = 5,131.76/x
  3. Step 3: Cross multiply
    18,982.76x = 28,474.07 × 5,131.76
  4. Step 4: Simplify right side
    18,982.76x = 146,121,925.43
  5. Step 5: Solve for x
    x = 146,121,925.43/18,982.76
  6. Step 6: Final answer
    x = 7,697.61

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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.