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Finding the Fourth Proportional to 1,212.96, 1,673.46 and 681.76

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Solution

The fourth proportional to 1,212.96, 1,673.46 and 681.76 is: 940.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.96 : 1,673.46 = 681.76 : x
  2. Step 2: Convert to fraction form
    1,212.96/1,673.46 = 681.76/x
  3. Step 3: Cross multiply
    1,212.96x = 1,673.46 × 681.76
  4. Step 4: Simplify right side
    1,212.96x = 1,140,898.09
  5. Step 5: Solve for x
    x = 1,140,898.09/1,212.96
  6. Step 6: Final answer
    x = 940.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.