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Finding the Fourth Proportional to 20,370.54, 30,560.67 and 7,890.87

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Solution

The fourth proportional to 20,370.54, 30,560.67 and 7,890.87 is: 11,838.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,370.54 : 30,560.67 = 7,890.87 : x
  2. Step 2: Convert to fraction form
    20,370.54/30,560.67 = 7,890.87/x
  3. Step 3: Cross multiply
    20,370.54x = 30,560.67 × 7,890.87
  4. Step 4: Simplify right side
    20,370.54x = 241,150,274.08
  5. Step 5: Solve for x
    x = 241,150,274.08/20,370.54
  6. Step 6: Final answer
    x = 11,838.19

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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.