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Finding the Fourth Proportional to 618.98, 855.26 and 487.24

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Solution

The fourth proportional to 618.98, 855.26 and 487.24 is: 673.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.98 : 855.26 = 487.24 : x
  2. Step 2: Convert to fraction form
    618.98/855.26 = 487.24/x
  3. Step 3: Cross multiply
    618.98x = 855.26 × 487.24
  4. Step 4: Simplify right side
    618.98x = 416,719.28
  5. Step 5: Solve for x
    x = 416,719.28/618.98
  6. Step 6: Final answer
    x = 673.24

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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.