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Finding the Fourth Proportional to 12,101.74, 18,121.52 and 7,929.43

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Solution

The fourth proportional to 12,101.74, 18,121.52 and 7,929.43 is: 11,873.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,101.74 : 18,121.52 = 7,929.43 : x
  2. Step 2: Convert to fraction form
    12,101.74/18,121.52 = 7,929.43/x
  3. Step 3: Cross multiply
    12,101.74x = 18,121.52 × 7,929.43
  4. Step 4: Simplify right side
    12,101.74x = 143,693,298.85
  5. Step 5: Solve for x
    x = 143,693,298.85/12,101.74
  6. Step 6: Final answer
    x = 11,873.77

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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.