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Finding the Fourth Proportional to 455.31, 628.32 and 248.31

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Solution

The fourth proportional to 455.31, 628.32 and 248.31 is: 342.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.31 : 628.32 = 248.31 : x
  2. Step 2: Convert to fraction form
    455.31/628.32 = 248.31/x
  3. Step 3: Cross multiply
    455.31x = 628.32 × 248.31
  4. Step 4: Simplify right side
    455.31x = 156,018.14
  5. Step 5: Solve for x
    x = 156,018.14/455.31
  6. Step 6: Final answer
    x = 342.66

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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.