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Finding the Fourth Proportional to 455.45, 628.13 and 289.60

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Solution

The fourth proportional to 455.45, 628.13 and 289.60 is: 399.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.45 : 628.13 = 289.60 : x
  2. Step 2: Convert to fraction form
    455.45/628.13 = 289.60/x
  3. Step 3: Cross multiply
    455.45x = 628.13 × 289.60
  4. Step 4: Simplify right side
    455.45x = 181,906.45
  5. Step 5: Solve for x
    x = 181,906.45/455.45
  6. Step 6: Final answer
    x = 399.40

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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.