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Finding the Fourth Proportional to 74.05, 102.20 and 49.48

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Solution

The fourth proportional to 74.05, 102.20 and 49.48 is: 68.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.05 : 102.20 = 49.48 : x
  2. Step 2: Convert to fraction form
    74.05/102.20 = 49.48/x
  3. Step 3: Cross multiply
    74.05x = 102.20 × 49.48
  4. Step 4: Simplify right side
    74.05x = 5,056.35
  5. Step 5: Solve for x
    x = 5,056.35/74.05
  6. Step 6: Final answer
    x = 68.29

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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.