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Finding the Fourth Proportional to 681.91, 1,021.31 and 535.33

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Solution

The fourth proportional to 681.91, 1,021.31 and 535.33 is: 801.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.91 : 1,021.31 = 535.33 : x
  2. Step 2: Convert to fraction form
    681.91/1,021.31 = 535.33/x
  3. Step 3: Cross multiply
    681.91x = 1,021.31 × 535.33
  4. Step 4: Simplify right side
    681.91x = 546,730.10
  5. Step 5: Solve for x
    x = 546,730.10/681.91
  6. Step 6: Final answer
    x = 801.76

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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.