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Finding the Fourth Proportional to 28.65, 42.79 and 20.02

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Solution

The fourth proportional to 28.65, 42.79 and 20.02 is: 29.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.65 : 42.79 = 20.02 : x
  2. Step 2: Convert to fraction form
    28.65/42.79 = 20.02/x
  3. Step 3: Cross multiply
    28.65x = 42.79 × 20.02
  4. Step 4: Simplify right side
    28.65x = 856.44
  5. Step 5: Solve for x
    x = 856.44/28.65
  6. Step 6: Final answer
    x = 29.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.