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Finding the Fourth Proportional to 18,415.20, 27,601.20 and 7,885.20

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Solution

The fourth proportional to 18,415.20, 27,601.20 and 7,885.20 is: 11,818.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,415.20 : 27,601.20 = 7,885.20 : x
  2. Step 2: Convert to fraction form
    18,415.20/27,601.20 = 7,885.20/x
  3. Step 3: Cross multiply
    18,415.20x = 27,601.20 × 7,885.20
  4. Step 4: Simplify right side
    18,415.20x = 217,640,982.24
  5. Step 5: Solve for x
    x = 217,640,982.24/18,415.20
  6. Step 6: Final answer
    x = 11,818.55

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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.