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Finding the Fourth Proportional to 681.72, 1,021.86 and 339

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Solution

The fourth proportional to 681.72, 1,021.86 and 339 is: 508.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.72 : 1,021.86 = 339 : x
  2. Step 2: Convert to fraction form
    681.72/1,021.86 = 339/x
  3. Step 3: Cross multiply
    681.72x = 1,021.86 × 339
  4. Step 4: Simplify right side
    681.72x = 346,410.54
  5. Step 5: Solve for x
    x = 346,410.54/681.72
  6. Step 6: Final answer
    x = 508.14

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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.