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Finding the Fourth Proportional to 24.99, 34.50 and 15.80

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Solution

The fourth proportional to 24.99, 34.50 and 15.80 is: 21.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.99 : 34.50 = 15.80 : x
  2. Step 2: Convert to fraction form
    24.99/34.50 = 15.80/x
  3. Step 3: Cross multiply
    24.99x = 34.50 × 15.80
  4. Step 4: Simplify right side
    24.99x = 544.93
  5. Step 5: Solve for x
    x = 544.93/24.99
  6. Step 6: Final answer
    x = 21.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.