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Finding the Fourth Proportional to 75.36, 104.72 and 74.50

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Solution

The fourth proportional to 75.36, 104.72 and 74.50 is: 103.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.36 : 104.72 = 74.50 : x
  2. Step 2: Convert to fraction form
    75.36/104.72 = 74.50/x
  3. Step 3: Cross multiply
    75.36x = 104.72 × 74.50
  4. Step 4: Simplify right side
    75.36x = 7,801.64
  5. Step 5: Solve for x
    x = 7,801.64/75.36
  6. Step 6: Final answer
    x = 103.52

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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.