Home / 1,211.55-1,815.30-1,138.65

Finding the Fourth Proportional to 1,211.55, 1,815.30 and 1,138.65

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Solution

The fourth proportional to 1,211.55, 1,815.30 and 1,138.65 is: 1,706.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.55 : 1,815.30 = 1,138.65 : x
  2. Step 2: Convert to fraction form
    1,211.55/1,815.30 = 1,138.65/x
  3. Step 3: Cross multiply
    1,211.55x = 1,815.30 × 1,138.65
  4. Step 4: Simplify right side
    1,211.55x = 2,066,991.35
  5. Step 5: Solve for x
    x = 2,066,991.35/1,211.55
  6. Step 6: Final answer
    x = 1,706.07

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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.