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Finding the Fourth Proportional to 13,980.80, 20,971.20 and 3,592.48

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Solution

The fourth proportional to 13,980.80, 20,971.20 and 3,592.48 is: 5,388.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980.80 : 20,971.20 = 3,592.48 : x
  2. Step 2: Convert to fraction form
    13,980.80/20,971.20 = 3,592.48/x
  3. Step 3: Cross multiply
    13,980.80x = 20,971.20 × 3,592.48
  4. Step 4: Simplify right side
    13,980.80x = 75,338,616.58
  5. Step 5: Solve for x
    x = 75,338,616.58/13,980.80
  6. Step 6: Final answer
    x = 5,388.72

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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.