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Finding the Fourth Proportional to 681.60, 1,022.76 and 408.23

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Solution

The fourth proportional to 681.60, 1,022.76 and 408.23 is: 612.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.60 : 1,022.76 = 408.23 : x
  2. Step 2: Convert to fraction form
    681.60/1,022.76 = 408.23/x
  3. Step 3: Cross multiply
    681.60x = 1,022.76 × 408.23
  4. Step 4: Simplify right side
    681.60x = 417,521.31
  5. Step 5: Solve for x
    x = 417,521.31/681.60
  6. Step 6: Final answer
    x = 612.56

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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.