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Finding the Fourth Proportional to 47.58, 71.41 and 21.89

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Solution

The fourth proportional to 47.58, 71.41 and 21.89 is: 32.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.58 : 71.41 = 21.89 : x
  2. Step 2: Convert to fraction form
    47.58/71.41 = 21.89/x
  3. Step 3: Cross multiply
    47.58x = 71.41 × 21.89
  4. Step 4: Simplify right side
    47.58x = 1,563.13
  5. Step 5: Solve for x
    x = 1,563.13/47.58
  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.