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Finding the Fourth Proportional to 730.65, 1,008.31 and 399.09

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Solution

The fourth proportional to 730.65, 1,008.31 and 399.09 is: 550.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.65 : 1,008.31 = 399.09 : x
  2. Step 2: Convert to fraction form
    730.65/1,008.31 = 399.09/x
  3. Step 3: Cross multiply
    730.65x = 1,008.31 × 399.09
  4. Step 4: Simplify right side
    730.65x = 402,406.44
  5. Step 5: Solve for x
    x = 402,406.44/730.65
  6. Step 6: Final answer
    x = 550.75

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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.