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Finding the Fourth Proportional to 1,327.79, 1,991.76 and 678.35

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Solution

The fourth proportional to 1,327.79, 1,991.76 and 678.35 is: 1,017.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.79 : 1,991.76 = 678.35 : x
  2. Step 2: Convert to fraction form
    1,327.79/1,991.76 = 678.35/x
  3. Step 3: Cross multiply
    1,327.79x = 1,991.76 × 678.35
  4. Step 4: Simplify right side
    1,327.79x = 1,351,100.44
  5. Step 5: Solve for x
    x = 1,351,100.44/1,327.79
  6. Step 6: Final answer
    x = 1,017.56

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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.