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Finding the Fourth Proportional to 455.31, 628.12 and 268.74

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Solution

The fourth proportional to 455.31, 628.12 and 268.74 is: 370.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.31 : 628.12 = 268.74 : x
  2. Step 2: Convert to fraction form
    455.31/628.12 = 268.74/x
  3. Step 3: Cross multiply
    455.31x = 628.12 × 268.74
  4. Step 4: Simplify right side
    455.31x = 168,800.97
  5. Step 5: Solve for x
    x = 168,800.97/455.31
  6. Step 6: Final answer
    x = 370.74

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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.