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Finding the Fourth Proportional to 1,212.35, 1,672.90 and 681.12

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Solution

The fourth proportional to 1,212.35, 1,672.90 and 681.12 is: 939.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.35 : 1,672.90 = 681.12 : x
  2. Step 2: Convert to fraction form
    1,212.35/1,672.90 = 681.12/x
  3. Step 3: Cross multiply
    1,212.35x = 1,672.90 × 681.12
  4. Step 4: Simplify right side
    1,212.35x = 1,139,445.65
  5. Step 5: Solve for x
    x = 1,139,445.65/1,212.35
  6. Step 6: Final answer
    x = 939.87

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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.