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Finding the Fourth Proportional to 20,930.50, 31,410.15 and 8,618.50

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Solution

The fourth proportional to 20,930.50, 31,410.15 and 8,618.50 is: 12,933.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.50 : 31,410.15 = 8,618.50 : x
  2. Step 2: Convert to fraction form
    20,930.50/31,410.15 = 8,618.50/x
  3. Step 3: Cross multiply
    20,930.50x = 31,410.15 × 8,618.50
  4. Step 4: Simplify right side
    20,930.50x = 270,708,377.78
  5. Step 5: Solve for x
    x = 270,708,377.78/20,930.50
  6. Step 6: Final answer
    x = 12,933.68

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1.5x scale

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.