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Finding the Fourth Proportional to 18,992.76, 28,485.76 and 5,138.52

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Solution

The fourth proportional to 18,992.76, 28,485.76 and 5,138.52 is: 7,706.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.76 : 28,485.76 = 5,138.52 : x
  2. Step 2: Convert to fraction form
    18,992.76/28,485.76 = 5,138.52/x
  3. Step 3: Cross multiply
    18,992.76x = 28,485.76 × 5,138.52
  4. Step 4: Simplify right side
    18,992.76x = 146,374,647.48
  5. Step 5: Solve for x
    x = 146,374,647.48/18,992.76
  6. Step 6: Final answer
    x = 7,706.87

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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.