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Finding the Fourth Proportional to 1,994.50, 2,991.80 and 678.25

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Solution

The fourth proportional to 1,994.50, 2,991.80 and 678.25 is: 1,017.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.50 : 2,991.80 = 678.25 : x
  2. Step 2: Convert to fraction form
    1,994.50/2,991.80 = 678.25/x
  3. Step 3: Cross multiply
    1,994.50x = 2,991.80 × 678.25
  4. Step 4: Simplify right side
    1,994.50x = 2,029,193.79
  5. Step 5: Solve for x
    x = 2,029,193.79/1,994.50
  6. Step 6: Final answer
    x = 1,017.39

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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.