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Finding the Fourth Proportional to 13,449.60, 20,145.60 and 11,721.60

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Solution

The fourth proportional to 13,449.60, 20,145.60 and 11,721.60 is: 17,557.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,449.60 : 20,145.60 = 11,721.60 : x
  2. Step 2: Convert to fraction form
    13,449.60/20,145.60 = 11,721.60/x
  3. Step 3: Cross multiply
    13,449.60x = 20,145.60 × 11,721.60
  4. Step 4: Simplify right side
    13,449.60x = 236,138,664.96
  5. Step 5: Solve for x
    x = 236,138,664.96/13,449.60
  6. Step 6: Final answer
    x = 17,557.30

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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.