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Finding the Fourth Proportional to 75.09, 102.88 and 74.38

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Solution

The fourth proportional to 75.09, 102.88 and 74.38 is: 101.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.09 : 102.88 = 74.38 : x
  2. Step 2: Convert to fraction form
    75.09/102.88 = 74.38/x
  3. Step 3: Cross multiply
    75.09x = 102.88 × 74.38
  4. Step 4: Simplify right side
    75.09x = 7,652.21
  5. Step 5: Solve for x
    x = 7,652.21/75.09
  6. Step 6: Final answer
    x = 101.91

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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.