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Finding the Fourth Proportional to 18,239.20, 27,358.80 and 12,407.20

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Solution

The fourth proportional to 18,239.20, 27,358.80 and 12,407.20 is: 18,610.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,239.20 : 27,358.80 = 12,407.20 : x
  2. Step 2: Convert to fraction form
    18,239.20/27,358.80 = 12,407.20/x
  3. Step 3: Cross multiply
    18,239.20x = 27,358.80 × 12,407.20
  4. Step 4: Simplify right side
    18,239.20x = 339,446,103.36
  5. Step 5: Solve for x
    x = 339,446,103.36/18,239.20
  6. Step 6: Final answer
    x = 18,610.80

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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.