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Finding the Fourth Proportional to 1,330.86, 1,996.11 and 681.60

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Solution

The fourth proportional to 1,330.86, 1,996.11 and 681.60 is: 1,022.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.86 : 1,996.11 = 681.60 : x
  2. Step 2: Convert to fraction form
    1,330.86/1,996.11 = 681.60/x
  3. Step 3: Cross multiply
    1,330.86x = 1,996.11 × 681.60
  4. Step 4: Simplify right side
    1,330.86x = 1,360,548.58
  5. Step 5: Solve for x
    x = 1,360,548.58/1,330.86
  6. Step 6: Final answer
    x = 1,022.31

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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.