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Finding the Fourth Proportional to 1,786.86, 2,679.75 and 690.96

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Solution

The fourth proportional to 1,786.86, 2,679.75 and 690.96 is: 1,036.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.86 : 2,679.75 = 690.96 : x
  2. Step 2: Convert to fraction form
    1,786.86/2,679.75 = 690.96/x
  3. Step 3: Cross multiply
    1,786.86x = 2,679.75 × 690.96
  4. Step 4: Simplify right side
    1,786.86x = 1,851,600.06
  5. Step 5: Solve for x
    x = 1,851,600.06/1,786.86
  6. Step 6: Final answer
    x = 1,036.23

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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.