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Finding the Fourth Proportional to 74.14, 111.18 and 31.36

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Solution

The fourth proportional to 74.14, 111.18 and 31.36 is: 47.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.14 : 111.18 = 31.36 : x
  2. Step 2: Convert to fraction form
    74.14/111.18 = 31.36/x
  3. Step 3: Cross multiply
    74.14x = 111.18 × 31.36
  4. Step 4: Simplify right side
    74.14x = 3,486.60
  5. Step 5: Solve for x
    x = 3,486.60/74.14
  6. Step 6: Final answer
    x = 47.03

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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.