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Finding the Fourth Proportional to 61.40, 92.12 and 38.63

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Solution

The fourth proportional to 61.40, 92.12 and 38.63 is: 57.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.40 : 92.12 = 38.63 : x
  2. Step 2: Convert to fraction form
    61.40/92.12 = 38.63/x
  3. Step 3: Cross multiply
    61.40x = 92.12 × 38.63
  4. Step 4: Simplify right side
    61.40x = 3,557.94
  5. Step 5: Solve for x
    x = 3,557.94/61.40
  6. Step 6: Final answer
    x = 57.95

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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.