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Finding the Fourth Proportional to 618.98, 854.94 and 479.55

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Solution

The fourth proportional to 618.98, 854.94 and 479.55 is: 662.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.98 : 854.94 = 479.55 : x
  2. Step 2: Convert to fraction form
    618.98/854.94 = 479.55/x
  3. Step 3: Cross multiply
    618.98x = 854.94 × 479.55
  4. Step 4: Simplify right side
    618.98x = 409,986.48
  5. Step 5: Solve for x
    x = 409,986.48/618.98
  6. Step 6: Final answer
    x = 662.36

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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.