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Finding the Fourth Proportional to 12,808.78, 19,213.17 and 3,574.78

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Solution

The fourth proportional to 12,808.78, 19,213.17 and 3,574.78 is: 5,362.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.78 : 19,213.17 = 3,574.78 : x
  2. Step 2: Convert to fraction form
    12,808.78/19,213.17 = 3,574.78/x
  3. Step 3: Cross multiply
    12,808.78x = 19,213.17 × 3,574.78
  4. Step 4: Simplify right side
    12,808.78x = 68,682,855.85
  5. Step 5: Solve for x
    x = 68,682,855.85/12,808.78
  6. Step 6: Final answer
    x = 5,362.17

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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.