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Finding the Fourth Proportional to 27.80, 38.28 and 26.45

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Solution

The fourth proportional to 27.80, 38.28 and 26.45 is: 36.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.80 : 38.28 = 26.45 : x
  2. Step 2: Convert to fraction form
    27.80/38.28 = 26.45/x
  3. Step 3: Cross multiply
    27.80x = 38.28 × 26.45
  4. Step 4: Simplify right side
    27.80x = 1,012.51
  5. Step 5: Solve for x
    x = 1,012.51/27.80
  6. Step 6: Final answer
    x = 36.42

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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.