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Finding the Fourth Proportional to 12.99, 19.40 and 10.11

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Solution

The fourth proportional to 12.99, 19.40 and 10.11 is: 15.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.99 : 19.40 = 10.11 : x
  2. Step 2: Convert to fraction form
    12.99/19.40 = 10.11/x
  3. Step 3: Cross multiply
    12.99x = 19.40 × 10.11
  4. Step 4: Simplify right side
    12.99x = 196.13
  5. Step 5: Solve for x
    x = 196.13/12.99
  6. Step 6: Final answer
    x = 15.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.