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Finding the Fourth Proportional to 34.64, 47.78 and 21.68

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Solution

The fourth proportional to 34.64, 47.78 and 21.68 is: 29.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.64 : 47.78 = 21.68 : x
  2. Step 2: Convert to fraction form
    34.64/47.78 = 21.68/x
  3. Step 3: Cross multiply
    34.64x = 47.78 × 21.68
  4. Step 4: Simplify right side
    34.64x = 1,035.87
  5. Step 5: Solve for x
    x = 1,035.87/34.64
  6. Step 6: Final answer
    x = 29.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.