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Finding the Fourth Proportional to 27.86, 41.75 and 21.43

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Solution

The fourth proportional to 27.86, 41.75 and 21.43 is: 32.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.86 : 41.75 = 21.43 : x
  2. Step 2: Convert to fraction form
    27.86/41.75 = 21.43/x
  3. Step 3: Cross multiply
    27.86x = 41.75 × 21.43
  4. Step 4: Simplify right side
    27.86x = 894.39
  5. Step 5: Solve for x
    x = 894.39/27.86
  6. Step 6: Final answer
    x = 32.10

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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.