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Finding the Fourth Proportional to 1,369.74, 2,054.52 and 639.48

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Solution

The fourth proportional to 1,369.74, 2,054.52 and 639.48 is: 959.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.74 : 2,054.52 = 639.48 : x
  2. Step 2: Convert to fraction form
    1,369.74/2,054.52 = 639.48/x
  3. Step 3: Cross multiply
    1,369.74x = 2,054.52 × 639.48
  4. Step 4: Simplify right side
    1,369.74x = 1,313,824.45
  5. Step 5: Solve for x
    x = 1,313,824.45/1,369.74
  6. Step 6: Final answer
    x = 959.18

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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.