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Finding the Fourth Proportional to 25.20, 37.82 and 9.99

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Solution

The fourth proportional to 25.20, 37.82 and 9.99 is: 15.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.20 : 37.82 = 9.99 : x
  2. Step 2: Convert to fraction form
    25.20/37.82 = 9.99/x
  3. Step 3: Cross multiply
    25.20x = 37.82 × 9.99
  4. Step 4: Simplify right side
    25.20x = 377.98
  5. Step 5: Solve for x
    x = 377.98/25.20
  6. Step 6: Final answer
    x = 15.00

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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.