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Finding the Fourth Proportional to 618.44, 855.09 and 540.63

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Solution

The fourth proportional to 618.44, 855.09 and 540.63 is: 747.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.44 : 855.09 = 540.63 : x
  2. Step 2: Convert to fraction form
    618.44/855.09 = 540.63/x
  3. Step 3: Cross multiply
    618.44x = 855.09 × 540.63
  4. Step 4: Simplify right side
    618.44x = 462,287.31
  5. Step 5: Solve for x
    x = 462,287.31/618.44
  6. Step 6: Final answer
    x = 747.51

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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.