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Finding the Fourth Proportional to 33.24, 45.81 and 31.18

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Solution

The fourth proportional to 33.24, 45.81 and 31.18 is: 42.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.24 : 45.81 = 31.18 : x
  2. Step 2: Convert to fraction form
    33.24/45.81 = 31.18/x
  3. Step 3: Cross multiply
    33.24x = 45.81 × 31.18
  4. Step 4: Simplify right side
    33.24x = 1,428.36
  5. Step 5: Solve for x
    x = 1,428.36/33.24
  6. Step 6: Final answer
    x = 42.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.