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Finding the Fourth Proportional to 455.64, 628.78 and 248.64

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Solution

The fourth proportional to 455.64, 628.78 and 248.64 is: 343.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.64 : 628.78 = 248.64 : x
  2. Step 2: Convert to fraction form
    455.64/628.78 = 248.64/x
  3. Step 3: Cross multiply
    455.64x = 628.78 × 248.64
  4. Step 4: Simplify right side
    455.64x = 156,339.86
  5. Step 5: Solve for x
    x = 156,339.86/455.64
  6. Step 6: Final answer
    x = 343.12

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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.