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Finding the Fourth Proportional to 455.78, 628.98 and 248.78

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Solution

The fourth proportional to 455.78, 628.98 and 248.78 is: 343.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.78 : 628.98 = 248.78 : x
  2. Step 2: Convert to fraction form
    455.78/628.98 = 248.78/x
  3. Step 3: Cross multiply
    455.78x = 628.98 × 248.78
  4. Step 4: Simplify right side
    455.78x = 156,479.22
  5. Step 5: Solve for x
    x = 156,479.22/455.78
  6. Step 6: Final answer
    x = 343.32

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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.