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Finding the Fourth Proportional to 74.18, 102.39 and 49.69

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Solution

The fourth proportional to 74.18, 102.39 and 49.69 is: 68.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.18 : 102.39 = 49.69 : x
  2. Step 2: Convert to fraction form
    74.18/102.39 = 49.69/x
  3. Step 3: Cross multiply
    74.18x = 102.39 × 49.69
  4. Step 4: Simplify right side
    74.18x = 5,087.76
  5. Step 5: Solve for x
    x = 5,087.76/74.18
  6. Step 6: Final answer
    x = 68.59

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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.