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Finding the Fourth Proportional to 28.72, 42.77 and 28.01

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Solution

The fourth proportional to 28.72, 42.77 and 28.01 is: 41.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.72 : 42.77 = 28.01 : x
  2. Step 2: Convert to fraction form
    28.72/42.77 = 28.01/x
  3. Step 3: Cross multiply
    28.72x = 42.77 × 28.01
  4. Step 4: Simplify right side
    28.72x = 1,198.16
  5. Step 5: Solve for x
    x = 1,198.16/28.72
  6. Step 6: Final answer
    x = 41.72

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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.