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Finding the Fourth Proportional to 1,212, 1,672.64 and 687.92

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Solution

The fourth proportional to 1,212, 1,672.64 and 687.92 is: 949.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212 : 1,672.64 = 687.92 : x
  2. Step 2: Convert to fraction form
    1,212/1,672.64 = 687.92/x
  3. Step 3: Cross multiply
    1,212x = 1,672.64 × 687.92
  4. Step 4: Simplify right side
    1,212x = 1,150,642.51
  5. Step 5: Solve for x
    x = 1,150,642.51/1,212
  6. Step 6: Final answer
    x = 949.38

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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.