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Finding the Fourth Proportional to 455.20, 628.18 and 268.68

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Solution

The fourth proportional to 455.20, 628.18 and 268.68 is: 370.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.20 : 628.18 = 268.68 : x
  2. Step 2: Convert to fraction form
    455.20/628.18 = 268.68/x
  3. Step 3: Cross multiply
    455.20x = 628.18 × 268.68
  4. Step 4: Simplify right side
    455.20x = 168,779.40
  5. Step 5: Solve for x
    x = 168,779.40/455.20
  6. Step 6: Final answer
    x = 370.78

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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.