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Finding the Fourth Proportional to 47.61, 71.36 and 21.91

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Solution

The fourth proportional to 47.61, 71.36 and 21.91 is: 32.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.61 : 71.36 = 21.91 : x
  2. Step 2: Convert to fraction form
    47.61/71.36 = 21.91/x
  3. Step 3: Cross multiply
    47.61x = 71.36 × 21.91
  4. Step 4: Simplify right side
    47.61x = 1,563.50
  5. Step 5: Solve for x
    x = 1,563.50/47.61
  6. Step 6: Final answer
    x = 32.84

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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.