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Finding the Fourth Proportional to 12,579.90, 18,833.40 and 12,215.40

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Solution

The fourth proportional to 12,579.90, 18,833.40 and 12,215.40 is: 18,287.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,579.90 : 18,833.40 = 12,215.40 : x
  2. Step 2: Convert to fraction form
    12,579.90/18,833.40 = 12,215.40/x
  3. Step 3: Cross multiply
    12,579.90x = 18,833.40 × 12,215.40
  4. Step 4: Simplify right side
    12,579.90x = 230,057,514.36
  5. Step 5: Solve for x
    x = 230,057,514.36/12,579.90
  6. Step 6: Final answer
    x = 18,287.71

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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.