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Finding the Fourth Proportional to 19,720, 27,213.60 and 13,443.36

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Solution

The fourth proportional to 19,720, 27,213.60 and 13,443.36 is: 18,551.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720 : 27,213.60 = 13,443.36 : x
  2. Step 2: Convert to fraction form
    19,720/27,213.60 = 13,443.36/x
  3. Step 3: Cross multiply
    19,720x = 27,213.60 × 13,443.36
  4. Step 4: Simplify right side
    19,720x = 365,842,221.70
  5. Step 5: Solve for x
    x = 365,842,221.70/19,720
  6. Step 6: Final answer
    x = 18,551.84

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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.