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Finding the Fourth Proportional to 23.05, 34.70 and 21.16

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Solution

The fourth proportional to 23.05, 34.70 and 21.16 is: 31.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.05 : 34.70 = 21.16 : x
  2. Step 2: Convert to fraction form
    23.05/34.70 = 21.16/x
  3. Step 3: Cross multiply
    23.05x = 34.70 × 21.16
  4. Step 4: Simplify right side
    23.05x = 734.25
  5. Step 5: Solve for x
    x = 734.25/23.05
  6. Step 6: Final answer
    x = 31.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.