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Finding the Fourth Proportional to 455.24, 682.86 and 386.60

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Solution

The fourth proportional to 455.24, 682.86 and 386.60 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.24 : 682.86 = 386.60 : x
  2. Step 2: Convert to fraction form
    455.24/682.86 = 386.60/x
  3. Step 3: Cross multiply
    455.24x = 682.86 × 386.60
  4. Step 4: Simplify right side
    455.24x = 263,991.71
  5. Step 5: Solve for x
    x = 263,991.71/455.24
  6. Step 6: Final answer
    x = 579.89

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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.