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Finding the Fourth Proportional to 18,777.68, 25,908.10 and 11,220.64

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Solution

The fourth proportional to 18,777.68, 25,908.10 and 11,220.64 is: 15,481.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,777.68 : 25,908.10 = 11,220.64 : x
  2. Step 2: Convert to fraction form
    18,777.68/25,908.10 = 11,220.64/x
  3. Step 3: Cross multiply
    18,777.68x = 25,908.10 × 11,220.64
  4. Step 4: Simplify right side
    18,777.68x = 290,705,463.18
  5. Step 5: Solve for x
    x = 290,705,463.18/18,777.68
  6. Step 6: Final answer
    x = 15,481.44

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1.5x scale

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.