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Finding the Fourth Proportional to 74.37, 102.39 and 68.70

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Solution

The fourth proportional to 74.37, 102.39 and 68.70 is: 94.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.37 : 102.39 = 68.70 : x
  2. Step 2: Convert to fraction form
    74.37/102.39 = 68.70/x
  3. Step 3: Cross multiply
    74.37x = 102.39 × 68.70
  4. Step 4: Simplify right side
    74.37x = 7,034.19
  5. Step 5: Solve for x
    x = 7,034.19/74.37
  6. Step 6: Final answer
    x = 94.58

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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.