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Finding the Fourth Proportional to 41.34, 61.95 and 21

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Solution

The fourth proportional to 41.34, 61.95 and 21 is: 31.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.34 : 61.95 = 21 : x
  2. Step 2: Convert to fraction form
    41.34/61.95 = 21/x
  3. Step 3: Cross multiply
    41.34x = 61.95 × 21
  4. Step 4: Simplify right side
    41.34x = 1,300.95
  5. Step 5: Solve for x
    x = 1,300.95/41.34
  6. Step 6: Final answer
    x = 31.47

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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.