Home / 2,211.60-3,317.40-1,390.80

Finding the Fourth Proportional to 2,211.60, 3,317.40 and 1,390.80

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Solution

The fourth proportional to 2,211.60, 3,317.40 and 1,390.80 is: 2,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,211.60 : 3,317.40 = 1,390.80 : x
  2. Step 2: Convert to fraction form
    2,211.60/3,317.40 = 1,390.80/x
  3. Step 3: Cross multiply
    2,211.60x = 3,317.40 × 1,390.80
  4. Step 4: Simplify right side
    2,211.60x = 4,613,839.92
  5. Step 5: Solve for x
    x = 4,613,839.92/2,211.60
  6. Step 6: Final answer
    x = 2,086.20

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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.