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Finding the Fourth Proportional to 75.18, 103.02 and 72.12

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Solution

The fourth proportional to 75.18, 103.02 and 72.12 is: 98.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.18 : 103.02 = 72.12 : x
  2. Step 2: Convert to fraction form
    75.18/103.02 = 72.12/x
  3. Step 3: Cross multiply
    75.18x = 103.02 × 72.12
  4. Step 4: Simplify right side
    75.18x = 7,429.80
  5. Step 5: Solve for x
    x = 7,429.80/75.18
  6. Step 6: Final answer
    x = 98.83

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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.