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Finding the Fourth Proportional to 74.98, 103.96 and 73.72

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Solution

The fourth proportional to 74.98, 103.96 and 73.72 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.98 : 103.96 = 73.72 : x
  2. Step 2: Convert to fraction form
    74.98/103.96 = 73.72/x
  3. Step 3: Cross multiply
    74.98x = 103.96 × 73.72
  4. Step 4: Simplify right side
    74.98x = 7,663.93
  5. Step 5: Solve for x
    x = 7,663.93/74.98
  6. Step 6: Final answer
    x = 102.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.