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Finding the Fourth Proportional to 28.42, 42.32 and 28.04

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Solution

The fourth proportional to 28.42, 42.32 and 28.04 is: 41.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.42 : 42.32 = 28.04 : x
  2. Step 2: Convert to fraction form
    28.42/42.32 = 28.04/x
  3. Step 3: Cross multiply
    28.42x = 42.32 × 28.04
  4. Step 4: Simplify right side
    28.42x = 1,186.65
  5. Step 5: Solve for x
    x = 1,186.65/28.42
  6. Step 6: Final answer
    x = 41.75

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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.