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Finding the Fourth Proportional to 18,320.80, 27,481.20 and 13,712.80

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Solution

The fourth proportional to 18,320.80, 27,481.20 and 13,712.80 is: 20,569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,320.80 : 27,481.20 = 13,712.80 : x
  2. Step 2: Convert to fraction form
    18,320.80/27,481.20 = 13,712.80/x
  3. Step 3: Cross multiply
    18,320.80x = 27,481.20 × 13,712.80
  4. Step 4: Simplify right side
    18,320.80x = 376,844,199.36
  5. Step 5: Solve for x
    x = 376,844,199.36/18,320.80
  6. Step 6: Final answer
    x = 20,569.20

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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.