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Finding the Fourth Proportional to 1,173.45, 1,757.78 and 678.41

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Solution

The fourth proportional to 1,173.45, 1,757.78 and 678.41 is: 1,016.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.45 : 1,757.78 = 678.41 : x
  2. Step 2: Convert to fraction form
    1,173.45/1,757.78 = 678.41/x
  3. Step 3: Cross multiply
    1,173.45x = 1,757.78 × 678.41
  4. Step 4: Simplify right side
    1,173.45x = 1,192,490.58
  5. Step 5: Solve for x
    x = 1,192,490.58/1,173.45
  6. Step 6: Final answer
    x = 1,016.23

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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.