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Finding the Fourth Proportional to 12,391.80, 18,576.90 and 7,456.20

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Solution

The fourth proportional to 12,391.80, 18,576.90 and 7,456.20 is: 11,177.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,391.80 : 18,576.90 = 7,456.20 : x
  2. Step 2: Convert to fraction form
    12,391.80/18,576.90 = 7,456.20/x
  3. Step 3: Cross multiply
    12,391.80x = 18,576.90 × 7,456.20
  4. Step 4: Simplify right side
    12,391.80x = 138,513,081.78
  5. Step 5: Solve for x
    x = 138,513,081.78/12,391.80
  6. Step 6: Final answer
    x = 11,177.80

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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.