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Finding the Fourth Proportional to 28.16, 38.87 and 19.99

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Solution

The fourth proportional to 28.16, 38.87 and 19.99 is: 27.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.16 : 38.87 = 19.99 : x
  2. Step 2: Convert to fraction form
    28.16/38.87 = 19.99/x
  3. Step 3: Cross multiply
    28.16x = 38.87 × 19.99
  4. Step 4: Simplify right side
    28.16x = 777.01
  5. Step 5: Solve for x
    x = 777.01/28.16
  6. Step 6: Final answer
    x = 27.59

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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.