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Finding the Fourth Proportional to 1,321.64, 1,983.15 and 959.42

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Solution

The fourth proportional to 1,321.64, 1,983.15 and 959.42 is: 1,439.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.64 : 1,983.15 = 959.42 : x
  2. Step 2: Convert to fraction form
    1,321.64/1,983.15 = 959.42/x
  3. Step 3: Cross multiply
    1,321.64x = 1,983.15 × 959.42
  4. Step 4: Simplify right side
    1,321.64x = 1,902,673.77
  5. Step 5: Solve for x
    x = 1,902,673.77/1,321.64
  6. Step 6: Final answer
    x = 1,439.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.