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Finding the Fourth Proportional to 7,415.62, 11,123.80 and 2,221

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Solution

The fourth proportional to 7,415.62, 11,123.80 and 2,221 is: 3,331.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,415.62 : 11,123.80 = 2,221 : x
  2. Step 2: Convert to fraction form
    7,415.62/11,123.80 = 2,221/x
  3. Step 3: Cross multiply
    7,415.62x = 11,123.80 × 2,221
  4. Step 4: Simplify right side
    7,415.62x = 24,705,959.80
  5. Step 5: Solve for x
    x = 24,705,959.80/7,415.62
  6. Step 6: Final answer
    x = 3,331.61

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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.