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Finding the Fourth Proportional to 13,998.88, 20,998.32 and 4,139.02

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Solution

The fourth proportional to 13,998.88, 20,998.32 and 4,139.02 is: 6,208.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,998.88 : 20,998.32 = 4,139.02 : x
  2. Step 2: Convert to fraction form
    13,998.88/20,998.32 = 4,139.02/x
  3. Step 3: Cross multiply
    13,998.88x = 20,998.32 × 4,139.02
  4. Step 4: Simplify right side
    13,998.88x = 86,912,466.45
  5. Step 5: Solve for x
    x = 86,912,466.45/13,998.88
  6. Step 6: Final answer
    x = 6,208.53

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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.