Home / 2,211.09-3,318-1,287.06

Finding the Fourth Proportional to 2,211.09, 3,318 and 1,287.06

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Solution

The fourth proportional to 2,211.09, 3,318 and 1,287.06 is: 1,931.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,211.09 : 3,318 = 1,287.06 : x
  2. Step 2: Convert to fraction form
    2,211.09/3,318 = 1,287.06/x
  3. Step 3: Cross multiply
    2,211.09x = 3,318 × 1,287.06
  4. Step 4: Simplify right side
    2,211.09x = 4,270,465.08
  5. Step 5: Solve for x
    x = 4,270,465.08/2,211.09
  6. Step 6: Final answer
    x = 1,931.38

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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.