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Finding the Fourth Proportional to 12,780.78, 19,171.17 and 5,855.28

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Solution

The fourth proportional to 12,780.78, 19,171.17 and 5,855.28 is: 8,782.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.78 : 19,171.17 = 5,855.28 : x
  2. Step 2: Convert to fraction form
    12,780.78/19,171.17 = 5,855.28/x
  3. Step 3: Cross multiply
    12,780.78x = 19,171.17 × 5,855.28
  4. Step 4: Simplify right side
    12,780.78x = 112,252,568.28
  5. Step 5: Solve for x
    x = 112,252,568.28/12,780.78
  6. Step 6: Final answer
    x = 8,782.92

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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.