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Finding the Fourth Proportional to 455.44, 628.40 and 289.36

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Solution

The fourth proportional to 455.44, 628.40 and 289.36 is: 399.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.44 : 628.40 = 289.36 : x
  2. Step 2: Convert to fraction form
    455.44/628.40 = 289.36/x
  3. Step 3: Cross multiply
    455.44x = 628.40 × 289.36
  4. Step 4: Simplify right side
    455.44x = 181,833.82
  5. Step 5: Solve for x
    x = 181,833.82/455.44
  6. Step 6: Final answer
    x = 399.25

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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.