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Finding the Fourth Proportional to 1,331.94, 1,994.84 and 639.08

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Solution

The fourth proportional to 1,331.94, 1,994.84 and 639.08 is: 957.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.94 : 1,994.84 = 639.08 : x
  2. Step 2: Convert to fraction form
    1,331.94/1,994.84 = 639.08/x
  3. Step 3: Cross multiply
    1,331.94x = 1,994.84 × 639.08
  4. Step 4: Simplify right side
    1,331.94x = 1,274,862.35
  5. Step 5: Solve for x
    x = 1,274,862.35/1,331.94
  6. Step 6: Final answer
    x = 957.15

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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.