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Finding the Fourth Proportional to 27.51, 41.28 and 20.99

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Solution

The fourth proportional to 27.51, 41.28 and 20.99 is: 31.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.51 : 41.28 = 20.99 : x
  2. Step 2: Convert to fraction form
    27.51/41.28 = 20.99/x
  3. Step 3: Cross multiply
    27.51x = 41.28 × 20.99
  4. Step 4: Simplify right side
    27.51x = 866.26
  5. Step 5: Solve for x
    x = 866.26/27.51
  6. Step 6: Final answer
    x = 31.49

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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.