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Finding the Fourth Proportional to 1,426.36, 1,968.62 and 867.21

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Solution

The fourth proportional to 1,426.36, 1,968.62 and 867.21 is: 1,196.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.36 : 1,968.62 = 867.21 : x
  2. Step 2: Convert to fraction form
    1,426.36/1,968.62 = 867.21/x
  3. Step 3: Cross multiply
    1,426.36x = 1,968.62 × 867.21
  4. Step 4: Simplify right side
    1,426.36x = 1,707,206.95
  5. Step 5: Solve for x
    x = 1,707,206.95/1,426.36
  6. Step 6: Final answer
    x = 1,196.90

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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.