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Finding the Fourth Proportional to 690.93, 1,036.26 and 197.21

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Solution

The fourth proportional to 690.93, 1,036.26 and 197.21 is: 295.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.93 : 1,036.26 = 197.21 : x
  2. Step 2: Convert to fraction form
    690.93/1,036.26 = 197.21/x
  3. Step 3: Cross multiply
    690.93x = 1,036.26 × 197.21
  4. Step 4: Simplify right side
    690.93x = 204,365.84
  5. Step 5: Solve for x
    x = 204,365.84/690.93
  6. Step 6: Final answer
    x = 295.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.