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Finding the Fourth Proportional to 1,333.32, 1,999.57 and 639.62

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Solution

The fourth proportional to 1,333.32, 1,999.57 and 639.62 is: 959.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,333.32 : 1,999.57 = 639.62 : x
  2. Step 2: Convert to fraction form
    1,333.32/1,999.57 = 639.62/x
  3. Step 3: Cross multiply
    1,333.32x = 1,999.57 × 639.62
  4. Step 4: Simplify right side
    1,333.32x = 1,278,964.96
  5. Step 5: Solve for x
    x = 1,278,964.96/1,333.32
  6. Step 6: Final answer
    x = 959.23

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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.