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Finding the Fourth Proportional to 456.09, 629.64 and 309.51

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Solution

The fourth proportional to 456.09, 629.64 and 309.51 is: 427.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.09 : 629.64 = 309.51 : x
  2. Step 2: Convert to fraction form
    456.09/629.64 = 309.51/x
  3. Step 3: Cross multiply
    456.09x = 629.64 × 309.51
  4. Step 4: Simplify right side
    456.09x = 194,879.88
  5. Step 5: Solve for x
    x = 194,879.88/456.09
  6. Step 6: Final answer
    x = 427.28

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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.