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Finding the Fourth Proportional to 455.81, 682.08 and 395.15

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Solution

The fourth proportional to 455.81, 682.08 and 395.15 is: 591.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.81 : 682.08 = 395.15 : x
  2. Step 2: Convert to fraction form
    455.81/682.08 = 395.15/x
  3. Step 3: Cross multiply
    455.81x = 682.08 × 395.15
  4. Step 4: Simplify right side
    455.81x = 269,523.91
  5. Step 5: Solve for x
    x = 269,523.91/455.81
  6. Step 6: Final answer
    x = 591.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.