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Finding the Fourth Proportional to 48, 71.94 and 19.11

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Solution

The fourth proportional to 48, 71.94 and 19.11 is: 28.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    48 : 71.94 = 19.11 : x
  2. Step 2: Convert to fraction form
    48/71.94 = 19.11/x
  3. Step 3: Cross multiply
    48x = 71.94 × 19.11
  4. Step 4: Simplify right side
    48x = 1,374.77
  5. Step 5: Solve for x
    x = 1,374.77/48
  6. Step 6: Final answer
    x = 28.64

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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.