Home / 1,211.29-1,817.21-345.67

Finding the Fourth Proportional to 1,211.29, 1,817.21 and 345.67

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Solution

The fourth proportional to 1,211.29, 1,817.21 and 345.67 is: 518.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.29 : 1,817.21 = 345.67 : x
  2. Step 2: Convert to fraction form
    1,211.29/1,817.21 = 345.67/x
  3. Step 3: Cross multiply
    1,211.29x = 1,817.21 × 345.67
  4. Step 4: Simplify right side
    1,211.29x = 628,154.98
  5. Step 5: Solve for x
    x = 628,154.98/1,211.29
  6. Step 6: Final answer
    x = 518.58

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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.