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Finding the Fourth Proportional to 13,930.92, 20,881.80 and 8,665.92

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Solution

The fourth proportional to 13,930.92, 20,881.80 and 8,665.92 is: 12,989.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,930.92 : 20,881.80 = 8,665.92 : x
  2. Step 2: Convert to fraction form
    13,930.92/20,881.80 = 8,665.92/x
  3. Step 3: Cross multiply
    13,930.92x = 20,881.80 × 8,665.92
  4. Step 4: Simplify right side
    13,930.92x = 180,960,008.26
  5. Step 5: Solve for x
    x = 180,960,008.26/13,930.92
  6. Step 6: Final answer
    x = 12,989.81

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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.