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Finding the Fourth Proportional to 52.25, 78.32 and 21.83

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Solution

The fourth proportional to 52.25, 78.32 and 21.83 is: 32.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.25 : 78.32 = 21.83 : x
  2. Step 2: Convert to fraction form
    52.25/78.32 = 21.83/x
  3. Step 3: Cross multiply
    52.25x = 78.32 × 21.83
  4. Step 4: Simplify right side
    52.25x = 1,709.73
  5. Step 5: Solve for x
    x = 1,709.73/52.25
  6. Step 6: Final answer
    x = 32.72

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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.