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Finding the Fourth Proportional to 681.50, 1,021.93 and 486.38

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Solution

The fourth proportional to 681.50, 1,021.93 and 486.38 is: 729.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.50 : 1,021.93 = 486.38 : x
  2. Step 2: Convert to fraction form
    681.50/1,021.93 = 486.38/x
  3. Step 3: Cross multiply
    681.50x = 1,021.93 × 486.38
  4. Step 4: Simplify right side
    681.50x = 497,046.31
  5. Step 5: Solve for x
    x = 497,046.31/681.50
  6. Step 6: Final answer
    x = 729.34

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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.