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Finding the Fourth Proportional to 1,333.06, 1,996.80 and 640.30

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Solution

The fourth proportional to 1,333.06, 1,996.80 and 640.30 is: 959.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.06 : 1,996.80 = 640.30 : x
  2. Step 2: Convert to fraction form
    1,333.06/1,996.80 = 640.30/x
  3. Step 3: Cross multiply
    1,333.06x = 1,996.80 × 640.30
  4. Step 4: Simplify right side
    1,333.06x = 1,278,551.04
  5. Step 5: Solve for x
    x = 1,278,551.04/1,333.06
  6. Step 6: Final answer
    x = 959.11

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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.