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Finding the Fourth Proportional to 56.17, 84.21 and 21.92

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Solution

The fourth proportional to 56.17, 84.21 and 21.92 is: 32.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.17 : 84.21 = 21.92 : x
  2. Step 2: Convert to fraction form
    56.17/84.21 = 21.92/x
  3. Step 3: Cross multiply
    56.17x = 84.21 × 21.92
  4. Step 4: Simplify right side
    56.17x = 1,845.38
  5. Step 5: Solve for x
    x = 1,845.38/56.17
  6. Step 6: Final answer
    x = 32.85

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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.