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Finding the Fourth Proportional to 13,620.40, 20,531.20 and 12,497.20

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Solution

The fourth proportional to 13,620.40, 20,531.20 and 12,497.20 is: 18,838.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.40 : 20,531.20 = 12,497.20 : x
  2. Step 2: Convert to fraction form
    13,620.40/20,531.20 = 12,497.20/x
  3. Step 3: Cross multiply
    13,620.40x = 20,531.20 × 12,497.20
  4. Step 4: Simplify right side
    13,620.40x = 256,582,512.64
  5. Step 5: Solve for x
    x = 256,582,512.64/13,620.40
  6. Step 6: Final answer
    x = 18,838.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.