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Finding the Fourth Proportional to 1,226.72, 1,839.44 and 678.08

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Solution

The fourth proportional to 1,226.72, 1,839.44 and 678.08 is: 1,016.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.72 : 1,839.44 = 678.08 : x
  2. Step 2: Convert to fraction form
    1,226.72/1,839.44 = 678.08/x
  3. Step 3: Cross multiply
    1,226.72x = 1,839.44 × 678.08
  4. Step 4: Simplify right side
    1,226.72x = 1,247,287.48
  5. Step 5: Solve for x
    x = 1,247,287.48/1,226.72
  6. Step 6: Final answer
    x = 1,016.77

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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.