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Finding the Fourth Proportional to 618.74, 851.60 and 494.00

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Solution

The fourth proportional to 618.74, 851.60 and 494.00 is: 679.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.74 : 851.60 = 494.00 : x
  2. Step 2: Convert to fraction form
    618.74/851.60 = 494.00/x
  3. Step 3: Cross multiply
    618.74x = 851.60 × 494.00
  4. Step 4: Simplify right side
    618.74x = 420,683.67
  5. Step 5: Solve for x
    x = 420,683.67/618.74
  6. Step 6: Final answer
    x = 679.91

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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.