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Finding the Fourth Proportional to 28.96, 39.96 and 20.77

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Solution

The fourth proportional to 28.96, 39.96 and 20.77 is: 28.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.96 : 39.96 = 20.77 : x
  2. Step 2: Convert to fraction form
    28.96/39.96 = 20.77/x
  3. Step 3: Cross multiply
    28.96x = 39.96 × 20.77
  4. Step 4: Simplify right side
    28.96x = 829.87
  5. Step 5: Solve for x
    x = 829.87/28.96
  6. Step 6: Final answer
    x = 28.66

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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.