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Finding the Fourth Proportional to 36.31, 54.21 and 31.15

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Solution

The fourth proportional to 36.31, 54.21 and 31.15 is: 46.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.31 : 54.21 = 31.15 : x
  2. Step 2: Convert to fraction form
    36.31/54.21 = 31.15/x
  3. Step 3: Cross multiply
    36.31x = 54.21 × 31.15
  4. Step 4: Simplify right side
    36.31x = 1,688.49
  5. Step 5: Solve for x
    x = 1,688.49/36.31
  6. Step 6: Final answer
    x = 46.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.