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Finding the Fourth Proportional to 679.79, 936.99 and 480.68

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Solution

The fourth proportional to 679.79, 936.99 and 480.68 is: 662.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.79 : 936.99 = 480.68 : x
  2. Step 2: Convert to fraction form
    679.79/936.99 = 480.68/x
  3. Step 3: Cross multiply
    679.79x = 936.99 × 480.68
  4. Step 4: Simplify right side
    679.79x = 450,397.80
  5. Step 5: Solve for x
    x = 450,397.80/679.79
  6. Step 6: Final answer
    x = 662.55

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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.