Home / 1,219.36-1,680.96-869.44

Finding the Fourth Proportional to 1,219.36, 1,680.96 and 869.44

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Solution

The fourth proportional to 1,219.36, 1,680.96 and 869.44 is: 1,198.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.36 : 1,680.96 = 869.44 : x
  2. Step 2: Convert to fraction form
    1,219.36/1,680.96 = 869.44/x
  3. Step 3: Cross multiply
    1,219.36x = 1,680.96 × 869.44
  4. Step 4: Simplify right side
    1,219.36x = 1,461,493.86
  5. Step 5: Solve for x
    x = 1,461,493.86/1,219.36
  6. Step 6: Final answer
    x = 1,198.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.