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Finding the Fourth Proportional to 331.08, 455.85 and 281.18

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Solution

The fourth proportional to 331.08, 455.85 and 281.18 is: 387.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.08 : 455.85 = 281.18 : x
  2. Step 2: Convert to fraction form
    331.08/455.85 = 281.18/x
  3. Step 3: Cross multiply
    331.08x = 455.85 × 281.18
  4. Step 4: Simplify right side
    331.08x = 128,174.50
  5. Step 5: Solve for x
    x = 128,174.50/331.08
  6. Step 6: Final answer
    x = 387.15

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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.