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Finding the Fourth Proportional to 455.99, 627.71 and 396.15

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Solution

The fourth proportional to 455.99, 627.71 and 396.15 is: 545.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.99 : 627.71 = 396.15 : x
  2. Step 2: Convert to fraction form
    455.99/627.71 = 396.15/x
  3. Step 3: Cross multiply
    455.99x = 627.71 × 396.15
  4. Step 4: Simplify right side
    455.99x = 248,665.34
  5. Step 5: Solve for x
    x = 248,665.34/455.99
  6. Step 6: Final answer
    x = 545.34

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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.