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Finding the Fourth Proportional to 679.40, 936.69 and 554.84

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Solution

The fourth proportional to 679.40, 936.69 and 554.84 is: 764.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.40 : 936.69 = 554.84 : x
  2. Step 2: Convert to fraction form
    679.40/936.69 = 554.84/x
  3. Step 3: Cross multiply
    679.40x = 936.69 × 554.84
  4. Step 4: Simplify right side
    679.40x = 519,713.08
  5. Step 5: Solve for x
    x = 519,713.08/679.40
  6. Step 6: Final answer
    x = 764.96

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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.