Home / 12,791.20-19,186.80-10,458.40

Finding the Fourth Proportional to 12,791.20, 19,186.80 and 10,458.40

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Solution

The fourth proportional to 12,791.20, 19,186.80 and 10,458.40 is: 15,687.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,791.20 : 19,186.80 = 10,458.40 : x
  2. Step 2: Convert to fraction form
    12,791.20/19,186.80 = 10,458.40/x
  3. Step 3: Cross multiply
    12,791.20x = 19,186.80 × 10,458.40
  4. Step 4: Simplify right side
    12,791.20x = 200,663,229.12
  5. Step 5: Solve for x
    x = 200,663,229.12/12,791.20
  6. Step 6: Final answer
    x = 15,687.60

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Similar ratio
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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.