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Finding the Fourth Proportional to 27.90, 38.45 and 25.80

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Solution

The fourth proportional to 27.90, 38.45 and 25.80 is: 35.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.90 : 38.45 = 25.80 : x
  2. Step 2: Convert to fraction form
    27.90/38.45 = 25.80/x
  3. Step 3: Cross multiply
    27.90x = 38.45 × 25.80
  4. Step 4: Simplify right side
    27.90x = 991.88
  5. Step 5: Solve for x
    x = 991.88/27.90
  6. Step 6: Final answer
    x = 35.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.