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Finding the Fourth Proportional to 74.05, 102.07 and 69.95

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Solution

The fourth proportional to 74.05, 102.07 and 69.95 is: 96.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.05 : 102.07 = 69.95 : x
  2. Step 2: Convert to fraction form
    74.05/102.07 = 69.95/x
  3. Step 3: Cross multiply
    74.05x = 102.07 × 69.95
  4. Step 4: Simplify right side
    74.05x = 7,139.80
  5. Step 5: Solve for x
    x = 7,139.80/74.05
  6. Step 6: Final answer
    x = 96.42

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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.