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Finding the Fourth Proportional to 27.20, 38.91 and 27.20

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Solution

The fourth proportional to 27.20, 38.91 and 27.20 is: 38.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.20 : 38.91 = 27.20 : x
  2. Step 2: Convert to fraction form
    27.20/38.91 = 27.20/x
  3. Step 3: Cross multiply
    27.20x = 38.91 × 27.20
  4. Step 4: Simplify right side
    27.20x = 1,058.16
  5. Step 5: Solve for x
    x = 1,058.16/27.20
  6. Step 6: Final answer
    x = 38.91

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.