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Finding the Fourth Proportional to 455.05, 628 and 289.31

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Solution

The fourth proportional to 455.05, 628 and 289.31 is: 399.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.05 : 628 = 289.31 : x
  2. Step 2: Convert to fraction form
    455.05/628 = 289.31/x
  3. Step 3: Cross multiply
    455.05x = 628 × 289.31
  4. Step 4: Simplify right side
    455.05x = 181,686.68
  5. Step 5: Solve for x
    x = 181,686.68/455.05
  6. Step 6: Final answer
    x = 399.27

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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.