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Finding the Fourth Proportional to 455.21, 628.19 and 248.21

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Solution

The fourth proportional to 455.21, 628.19 and 248.21 is: 342.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.21 : 628.19 = 248.21 : x
  2. Step 2: Convert to fraction form
    455.21/628.19 = 248.21/x
  3. Step 3: Cross multiply
    455.21x = 628.19 × 248.21
  4. Step 4: Simplify right side
    455.21x = 155,918.66
  5. Step 5: Solve for x
    x = 155,918.66/455.21
  6. Step 6: Final answer
    x = 342.52

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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.