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Finding the Fourth Proportional to 399.15, 550.26 and 282.51

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Solution

The fourth proportional to 399.15, 550.26 and 282.51 is: 389.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.15 : 550.26 = 282.51 : x
  2. Step 2: Convert to fraction form
    399.15/550.26 = 282.51/x
  3. Step 3: Cross multiply
    399.15x = 550.26 × 282.51
  4. Step 4: Simplify right side
    399.15x = 155,453.95
  5. Step 5: Solve for x
    x = 155,453.95/399.15
  6. Step 6: Final answer
    x = 389.46

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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.