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Finding the Fourth Proportional to 12,150.20, 18,203.70 and 10,422.20

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Solution

The fourth proportional to 12,150.20, 18,203.70 and 10,422.20 is: 15,614.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,150.20 : 18,203.70 = 10,422.20 : x
  2. Step 2: Convert to fraction form
    12,150.20/18,203.70 = 10,422.20/x
  3. Step 3: Cross multiply
    12,150.20x = 18,203.70 × 10,422.20
  4. Step 4: Simplify right side
    12,150.20x = 189,722,602.14
  5. Step 5: Solve for x
    x = 189,722,602.14/12,150.20
  6. Step 6: Final answer
    x = 15,614.77

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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.