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Finding the Fourth Proportional to 74.96, 112.36 and 31.60

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Solution

The fourth proportional to 74.96, 112.36 and 31.60 is: 47.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.96 : 112.36 = 31.60 : x
  2. Step 2: Convert to fraction form
    74.96/112.36 = 31.60/x
  3. Step 3: Cross multiply
    74.96x = 112.36 × 31.60
  4. Step 4: Simplify right side
    74.96x = 3,550.58
  5. Step 5: Solve for x
    x = 3,550.58/74.96
  6. Step 6: Final answer
    x = 47.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.