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Finding the Fourth Proportional to 681.35, 1,021.55 and 356.94

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Solution

The fourth proportional to 681.35, 1,021.55 and 356.94 is: 535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.35 : 1,021.55 = 356.94 : x
  2. Step 2: Convert to fraction form
    681.35/1,021.55 = 356.94/x
  3. Step 3: Cross multiply
    681.35x = 1,021.55 × 356.94
  4. Step 4: Simplify right side
    681.35x = 364,630.27
  5. Step 5: Solve for x
    x = 364,630.27/681.35
  6. Step 6: Final answer
    x = 535.16

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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.