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Finding the Fourth Proportional to 74.88, 103.20 and 67.98

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Solution

The fourth proportional to 74.88, 103.20 and 67.98 is: 93.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.88 : 103.20 = 67.98 : x
  2. Step 2: Convert to fraction form
    74.88/103.20 = 67.98/x
  3. Step 3: Cross multiply
    74.88x = 103.20 × 67.98
  4. Step 4: Simplify right side
    74.88x = 7,015.54
  5. Step 5: Solve for x
    x = 7,015.54/74.88
  6. Step 6: Final answer
    x = 93.69

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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.