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Finding the Fourth Proportional to 21,999.53, 30,355.11 and 13,054.97

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Solution

The fourth proportional to 21,999.53, 30,355.11 and 13,054.97 is: 18,013.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.53 : 30,355.11 = 13,054.97 : x
  2. Step 2: Convert to fraction form
    21,999.53/30,355.11 = 13,054.97/x
  3. Step 3: Cross multiply
    21,999.53x = 30,355.11 × 13,054.97
  4. Step 4: Simplify right side
    21,999.53x = 396,284,898.62
  5. Step 5: Solve for x
    x = 396,284,898.62/21,999.53
  6. Step 6: Final answer
    x = 18,013.34

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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.