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Finding the Fourth Proportional to 33.21, 45.87 and 31.86

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Solution

The fourth proportional to 33.21, 45.87 and 31.86 is: 44.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.21 : 45.87 = 31.86 : x
  2. Step 2: Convert to fraction form
    33.21/45.87 = 31.86/x
  3. Step 3: Cross multiply
    33.21x = 45.87 × 31.86
  4. Step 4: Simplify right side
    33.21x = 1,461.42
  5. Step 5: Solve for x
    x = 1,461.42/33.21
  6. Step 6: Final answer
    x = 44.01

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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.