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Finding the Fourth Proportional to 74.51, 102.22 and 69.85

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Solution

The fourth proportional to 74.51, 102.22 and 69.85 is: 95.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.51 : 102.22 = 69.85 : x
  2. Step 2: Convert to fraction form
    74.51/102.22 = 69.85/x
  3. Step 3: Cross multiply
    74.51x = 102.22 × 69.85
  4. Step 4: Simplify right side
    74.51x = 7,140.07
  5. Step 5: Solve for x
    x = 7,140.07/74.51
  6. Step 6: Final answer
    x = 95.83

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.