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Finding the Fourth Proportional to 38.16, 52.44 and 31.68

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Solution

The fourth proportional to 38.16, 52.44 and 31.68 is: 43.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.16 : 52.44 = 31.68 : x
  2. Step 2: Convert to fraction form
    38.16/52.44 = 31.68/x
  3. Step 3: Cross multiply
    38.16x = 52.44 × 31.68
  4. Step 4: Simplify right side
    38.16x = 1,661.30
  5. Step 5: Solve for x
    x = 1,661.30/38.16
  6. Step 6: Final answer
    x = 43.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.