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Finding the Fourth Proportional to 1,212.36, 1,673.04 and 688.38

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Solution

The fourth proportional to 1,212.36, 1,673.04 and 688.38 is: 949.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.36 : 1,673.04 = 688.38 : x
  2. Step 2: Convert to fraction form
    1,212.36/1,673.04 = 688.38/x
  3. Step 3: Cross multiply
    1,212.36x = 1,673.04 × 688.38
  4. Step 4: Simplify right side
    1,212.36x = 1,151,687.28
  5. Step 5: Solve for x
    x = 1,151,687.28/1,212.36
  6. Step 6: Final answer
    x = 949.95

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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.