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Finding the Fourth Proportional to 455.26, 628.28 and 258.78

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Solution

The fourth proportional to 455.26, 628.28 and 258.78 is: 357.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.26 : 628.28 = 258.78 : x
  2. Step 2: Convert to fraction form
    455.26/628.28 = 258.78/x
  3. Step 3: Cross multiply
    455.26x = 628.28 × 258.78
  4. Step 4: Simplify right side
    455.26x = 162,586.30
  5. Step 5: Solve for x
    x = 162,586.30/455.26
  6. Step 6: Final answer
    x = 357.13

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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.