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Finding the Fourth Proportional to 455.21, 627.51 and 280.25

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Solution

The fourth proportional to 455.21, 627.51 and 280.25 is: 386.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.21 : 627.51 = 280.25 : x
  2. Step 2: Convert to fraction form
    455.21/627.51 = 280.25/x
  3. Step 3: Cross multiply
    455.21x = 627.51 × 280.25
  4. Step 4: Simplify right side
    455.21x = 175,859.68
  5. Step 5: Solve for x
    x = 175,859.68/455.21
  6. Step 6: Final answer
    x = 386.33

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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.