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Finding the Fourth Proportional to 12,220.20, 18,330.90 and 6,388.20

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Solution

The fourth proportional to 12,220.20, 18,330.90 and 6,388.20 is: 9,582.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,220.20 : 18,330.90 = 6,388.20 : x
  2. Step 2: Convert to fraction form
    12,220.20/18,330.90 = 6,388.20/x
  3. Step 3: Cross multiply
    12,220.20x = 18,330.90 × 6,388.20
  4. Step 4: Simplify right side
    12,220.20x = 117,101,455.38
  5. Step 5: Solve for x
    x = 117,101,455.38/12,220.20
  6. Step 6: Final answer
    x = 9,582.61

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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.