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Finding the Fourth Proportional to 681.14, 1,020.79 and 355.84

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Solution

The fourth proportional to 681.14, 1,020.79 and 355.84 is: 533.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.14 : 1,020.79 = 355.84 : x
  2. Step 2: Convert to fraction form
    681.14/1,020.79 = 355.84/x
  3. Step 3: Cross multiply
    681.14x = 1,020.79 × 355.84
  4. Step 4: Simplify right side
    681.14x = 363,237.91
  5. Step 5: Solve for x
    x = 363,237.91/681.14
  6. Step 6: Final answer
    x = 533.28

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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.