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Finding the Fourth Proportional to 71.81, 107.66 and 48.92

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Solution

The fourth proportional to 71.81, 107.66 and 48.92 is: 73.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.81 : 107.66 = 48.92 : x
  2. Step 2: Convert to fraction form
    71.81/107.66 = 48.92/x
  3. Step 3: Cross multiply
    71.81x = 107.66 × 48.92
  4. Step 4: Simplify right side
    71.81x = 5,266.48
  5. Step 5: Solve for x
    x = 5,266.48/71.81
  6. Step 6: Final answer
    x = 73.34

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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.