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Finding the Fourth Proportional to 47.95, 71.63 and 38.92

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Solution

The fourth proportional to 47.95, 71.63 and 38.92 is: 58.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.95 : 71.63 = 38.92 : x
  2. Step 2: Convert to fraction form
    47.95/71.63 = 38.92/x
  3. Step 3: Cross multiply
    47.95x = 71.63 × 38.92
  4. Step 4: Simplify right side
    47.95x = 2,787.84
  5. Step 5: Solve for x
    x = 2,787.84/47.95
  6. Step 6: Final answer
    x = 58.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.