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Finding the Fourth Proportional to 12,011.82, 18,001.34 and 7,621.42

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Solution

The fourth proportional to 12,011.82, 18,001.34 and 7,621.42 is: 11,421.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,011.82 : 18,001.34 = 7,621.42 : x
  2. Step 2: Convert to fraction form
    12,011.82/18,001.34 = 7,621.42/x
  3. Step 3: Cross multiply
    12,011.82x = 18,001.34 × 7,621.42
  4. Step 4: Simplify right side
    12,011.82x = 137,195,772.70
  5. Step 5: Solve for x
    x = 137,195,772.70/12,011.82
  6. Step 6: Final answer
    x = 11,421.73

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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.