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Finding the Fourth Proportional to 681, 1,021.51 and 356.30

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Solution

The fourth proportional to 681, 1,021.51 and 356.30 is: 534.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    681 : 1,021.51 = 356.30 : x
  2. Step 2: Convert to fraction form
    681/1,021.51 = 356.30/x
  3. Step 3: Cross multiply
    681x = 1,021.51 × 356.30
  4. Step 4: Simplify right side
    681x = 363,958.91
  5. Step 5: Solve for x
    x = 363,958.91/681
  6. Step 6: Final answer
    x = 534.45

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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.