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Finding the Fourth Proportional to 393.09, 540.86 and 360.69

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Solution

The fourth proportional to 393.09, 540.86 and 360.69 is: 496.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.09 : 540.86 = 360.69 : x
  2. Step 2: Convert to fraction form
    393.09/540.86 = 360.69/x
  3. Step 3: Cross multiply
    393.09x = 540.86 × 360.69
  4. Step 4: Simplify right side
    393.09x = 195,080.99
  5. Step 5: Solve for x
    x = 195,080.99/393.09
  6. Step 6: Final answer
    x = 496.28

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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.