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Finding the Fourth Proportional to 21.85, 32.75 and 11.71

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Solution

The fourth proportional to 21.85, 32.75 and 11.71 is: 17.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.85 : 32.75 = 11.71 : x
  2. Step 2: Convert to fraction form
    21.85/32.75 = 11.71/x
  3. Step 3: Cross multiply
    21.85x = 32.75 × 11.71
  4. Step 4: Simplify right side
    21.85x = 383.36
  5. Step 5: Solve for x
    x = 383.36/21.85
  6. Step 6: Final answer
    x = 17.55

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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.