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Finding the Fourth Proportional to 68.70, 102.90 and 49.48

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Solution

The fourth proportional to 68.70, 102.90 and 49.48 is: 74.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.70 : 102.90 = 49.48 : x
  2. Step 2: Convert to fraction form
    68.70/102.90 = 49.48/x
  3. Step 3: Cross multiply
    68.70x = 102.90 × 49.48
  4. Step 4: Simplify right side
    68.70x = 5,091.17
  5. Step 5: Solve for x
    x = 5,091.17/68.70
  6. Step 6: Final answer
    x = 74.11

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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.