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Finding the Fourth Proportional to 681.52, 1,021.56 and 621.38

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Solution

The fourth proportional to 681.52, 1,021.56 and 621.38 is: 931.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.52 : 1,021.56 = 621.38 : x
  2. Step 2: Convert to fraction form
    681.52/1,021.56 = 621.38/x
  3. Step 3: Cross multiply
    681.52x = 1,021.56 × 621.38
  4. Step 4: Simplify right side
    681.52x = 634,771.85
  5. Step 5: Solve for x
    x = 634,771.85/681.52
  6. Step 6: Final answer
    x = 931.41

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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.