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Finding the Fourth Proportional to 13,420.66, 20,143.79 and 8,236.66

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Solution

The fourth proportional to 13,420.66, 20,143.79 and 8,236.66 is: 12,362.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.66 : 20,143.79 = 8,236.66 : x
  2. Step 2: Convert to fraction form
    13,420.66/20,143.79 = 8,236.66/x
  3. Step 3: Cross multiply
    13,420.66x = 20,143.79 × 8,236.66
  4. Step 4: Simplify right side
    13,420.66x = 165,917,549.34
  5. Step 5: Solve for x
    x = 165,917,549.34/13,420.66
  6. Step 6: Final answer
    x = 12,362.85

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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.