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Finding the Fourth Proportional to 68.70, 103.42 and 52.74

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Solution

The fourth proportional to 68.70, 103.42 and 52.74 is: 79.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.70 : 103.42 = 52.74 : x
  2. Step 2: Convert to fraction form
    68.70/103.42 = 52.74/x
  3. Step 3: Cross multiply
    68.70x = 103.42 × 52.74
  4. Step 4: Simplify right side
    68.70x = 5,454.37
  5. Step 5: Solve for x
    x = 5,454.37/68.70
  6. Step 6: Final answer
    x = 79.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.