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Finding the Fourth Proportional to 455.28, 628.38 and 308.16

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Solution

The fourth proportional to 455.28, 628.38 and 308.16 is: 425.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.28 : 628.38 = 308.16 : x
  2. Step 2: Convert to fraction form
    455.28/628.38 = 308.16/x
  3. Step 3: Cross multiply
    455.28x = 628.38 × 308.16
  4. Step 4: Simplify right side
    455.28x = 193,641.58
  5. Step 5: Solve for x
    x = 193,641.58/455.28
  6. Step 6: Final answer
    x = 425.32

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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.