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Finding the Fourth Proportional to 1,369.36, 2,054.07 and 639.46

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Solution

The fourth proportional to 1,369.36, 2,054.07 and 639.46 is: 959.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.36 : 2,054.07 = 639.46 : x
  2. Step 2: Convert to fraction form
    1,369.36/2,054.07 = 639.46/x
  3. Step 3: Cross multiply
    1,369.36x = 2,054.07 × 639.46
  4. Step 4: Simplify right side
    1,369.36x = 1,313,495.60
  5. Step 5: Solve for x
    x = 1,313,495.60/1,369.36
  6. Step 6: Final answer
    x = 959.20

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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.