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Finding the Fourth Proportional to 13,728.52, 18,945.66 and 8,420.20

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Solution

The fourth proportional to 13,728.52, 18,945.66 and 8,420.20 is: 11,620.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.52 : 18,945.66 = 8,420.20 : x
  2. Step 2: Convert to fraction form
    13,728.52/18,945.66 = 8,420.20/x
  3. Step 3: Cross multiply
    13,728.52x = 18,945.66 × 8,420.20
  4. Step 4: Simplify right side
    13,728.52x = 159,526,246.33
  5. Step 5: Solve for x
    x = 159,526,246.33/13,728.52
  6. Step 6: Final answer
    x = 11,620.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.