Home / 1,219.64-1,683.87-939.35

Finding the Fourth Proportional to 1,219.64, 1,683.87 and 939.35

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Solution

The fourth proportional to 1,219.64, 1,683.87 and 939.35 is: 1,296.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.64 : 1,683.87 = 939.35 : x
  2. Step 2: Convert to fraction form
    1,219.64/1,683.87 = 939.35/x
  3. Step 3: Cross multiply
    1,219.64x = 1,683.87 × 939.35
  4. Step 4: Simplify right side
    1,219.64x = 1,581,739.78
  5. Step 5: Solve for x
    x = 1,581,739.78/1,219.64
  6. Step 6: Final answer
    x = 1,296.89

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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.