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Finding the Fourth Proportional to 28.96, 39.89 and 22.79

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Solution

The fourth proportional to 28.96, 39.89 and 22.79 is: 31.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.96 : 39.89 = 22.79 : x
  2. Step 2: Convert to fraction form
    28.96/39.89 = 22.79/x
  3. Step 3: Cross multiply
    28.96x = 39.89 × 22.79
  4. Step 4: Simplify right side
    28.96x = 909.25
  5. Step 5: Solve for x
    x = 909.25/28.96
  6. Step 6: Final answer
    x = 31.40

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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.