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Finding the Fourth Proportional to 455.42, 682.66 and 239.15

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Solution

The fourth proportional to 455.42, 682.66 and 239.15 is: 358.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.42 : 682.66 = 239.15 : x
  2. Step 2: Convert to fraction form
    455.42/682.66 = 239.15/x
  3. Step 3: Cross multiply
    455.42x = 682.66 × 239.15
  4. Step 4: Simplify right side
    455.42x = 163,260.14
  5. Step 5: Solve for x
    x = 163,260.14/455.42
  6. Step 6: Final answer
    x = 358.48

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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.