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Finding the Fourth Proportional to 74.39, 102.69 and 49.82

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Solution

The fourth proportional to 74.39, 102.69 and 49.82 is: 68.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.39 : 102.69 = 49.82 : x
  2. Step 2: Convert to fraction form
    74.39/102.69 = 49.82/x
  3. Step 3: Cross multiply
    74.39x = 102.69 × 49.82
  4. Step 4: Simplify right side
    74.39x = 5,116.27
  5. Step 5: Solve for x
    x = 5,116.27/74.39
  6. Step 6: Final answer
    x = 68.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.