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Finding the Fourth Proportional to 12,991.99, 19,490.42 and 5,201.41

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Solution

The fourth proportional to 12,991.99, 19,490.42 and 5,201.41 is: 7,803.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.99 : 19,490.42 = 5,201.41 : x
  2. Step 2: Convert to fraction form
    12,991.99/19,490.42 = 5,201.41/x
  3. Step 3: Cross multiply
    12,991.99x = 19,490.42 × 5,201.41
  4. Step 4: Simplify right side
    12,991.99x = 101,377,665.49
  5. Step 5: Solve for x
    x = 101,377,665.49/12,991.99
  6. Step 6: Final answer
    x = 7,803.09

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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.