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Finding the Fourth Proportional to 74.95, 103.96 and 72.36

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Solution

The fourth proportional to 74.95, 103.96 and 72.36 is: 100.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.95 : 103.96 = 72.36 : x
  2. Step 2: Convert to fraction form
    74.95/103.96 = 72.36/x
  3. Step 3: Cross multiply
    74.95x = 103.96 × 72.36
  4. Step 4: Simplify right side
    74.95x = 7,522.55
  5. Step 5: Solve for x
    x = 7,522.55/74.95
  6. Step 6: Final answer
    x = 100.37

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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.