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Finding the Fourth Proportional to 455.34, 628.38 and 248.34

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Solution

The fourth proportional to 455.34, 628.38 and 248.34 is: 342.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.34 : 628.38 = 248.34 : x
  2. Step 2: Convert to fraction form
    455.34/628.38 = 248.34/x
  3. Step 3: Cross multiply
    455.34x = 628.38 × 248.34
  4. Step 4: Simplify right side
    455.34x = 156,051.89
  5. Step 5: Solve for x
    x = 156,051.89/455.34
  6. Step 6: Final answer
    x = 342.72

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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.