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Finding the Fourth Proportional to 455.68, 628.57 and 287.36

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Solution

The fourth proportional to 455.68, 628.57 and 287.36 is: 396.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.68 : 628.57 = 287.36 : x
  2. Step 2: Convert to fraction form
    455.68/628.57 = 287.36/x
  3. Step 3: Cross multiply
    455.68x = 628.57 × 287.36
  4. Step 4: Simplify right side
    455.68x = 180,625.88
  5. Step 5: Solve for x
    x = 180,625.88/455.68
  6. Step 6: Final answer
    x = 396.39

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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.