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Finding the Fourth Proportional to 34.52, 47.64 and 21.58

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Solution

The fourth proportional to 34.52, 47.64 and 21.58 is: 29.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.52 : 47.64 = 21.58 : x
  2. Step 2: Convert to fraction form
    34.52/47.64 = 21.58/x
  3. Step 3: Cross multiply
    34.52x = 47.64 × 21.58
  4. Step 4: Simplify right side
    34.52x = 1,028.07
  5. Step 5: Solve for x
    x = 1,028.07/34.52
  6. Step 6: Final answer
    x = 29.78

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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.