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Finding the Fourth Proportional to 1,321.66, 1,822.62 and 1,072.63

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Solution

The fourth proportional to 1,321.66, 1,822.62 and 1,072.63 is: 1,479.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.66 : 1,822.62 = 1,072.63 : x
  2. Step 2: Convert to fraction form
    1,321.66/1,822.62 = 1,072.63/x
  3. Step 3: Cross multiply
    1,321.66x = 1,822.62 × 1,072.63
  4. Step 4: Simplify right side
    1,321.66x = 1,954,996.89
  5. Step 5: Solve for x
    x = 1,954,996.89/1,321.66
  6. Step 6: Final answer
    x = 1,479.20

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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.