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Finding the Fourth Proportional to 28.88, 39.88 and 21.99

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Solution

The fourth proportional to 28.88, 39.88 and 21.99 is: 30.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.88 : 39.88 = 21.99 : x
  2. Step 2: Convert to fraction form
    28.88/39.88 = 21.99/x
  3. Step 3: Cross multiply
    28.88x = 39.88 × 21.99
  4. Step 4: Simplify right side
    28.88x = 877.14
  5. Step 5: Solve for x
    x = 877.14/28.88
  6. Step 6: Final answer
    x = 30.37

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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.