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Finding the Fourth Proportional to 28.48, 42.78 and 28.16

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Solution

The fourth proportional to 28.48, 42.78 and 28.16 is: 42.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.48 : 42.78 = 28.16 : x
  2. Step 2: Convert to fraction form
    28.48/42.78 = 28.16/x
  3. Step 3: Cross multiply
    28.48x = 42.78 × 28.16
  4. Step 4: Simplify right side
    28.48x = 1,204.68
  5. Step 5: Solve for x
    x = 1,204.68/28.48
  6. Step 6: Final answer
    x = 42.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.