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Finding the Fourth Proportional to 28.88, 42.96 and 28.08

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Solution

The fourth proportional to 28.88, 42.96 and 28.08 is: 41.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.88 : 42.96 = 28.08 : x
  2. Step 2: Convert to fraction form
    28.88/42.96 = 28.08/x
  3. Step 3: Cross multiply
    28.88x = 42.96 × 28.08
  4. Step 4: Simplify right side
    28.88x = 1,206.32
  5. Step 5: Solve for x
    x = 1,206.32/28.88
  6. Step 6: Final answer
    x = 41.77

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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.