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Finding the Fourth Proportional to 690.82, 1,036.21 and 203.88

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Solution

The fourth proportional to 690.82, 1,036.21 and 203.88 is: 305.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.82 : 1,036.21 = 203.88 : x
  2. Step 2: Convert to fraction form
    690.82/1,036.21 = 203.88/x
  3. Step 3: Cross multiply
    690.82x = 1,036.21 × 203.88
  4. Step 4: Simplify right side
    690.82x = 211,262.49
  5. Step 5: Solve for x
    x = 211,262.49/690.82
  6. Step 6: Final answer
    x = 305.81

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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.