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Finding the Fourth Proportional to 681.90, 1,021.25 and 334.15

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Solution

The fourth proportional to 681.90, 1,021.25 and 334.15 is: 500.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.90 : 1,021.25 = 334.15 : x
  2. Step 2: Convert to fraction form
    681.90/1,021.25 = 334.15/x
  3. Step 3: Cross multiply
    681.90x = 1,021.25 × 334.15
  4. Step 4: Simplify right side
    681.90x = 341,250.69
  5. Step 5: Solve for x
    x = 341,250.69/681.90
  6. Step 6: Final answer
    x = 500.44

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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.