Home / 1,211.38-1,817.10-345.70

Finding the Fourth Proportional to 1,211.38, 1,817.10 and 345.70

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Solution

The fourth proportional to 1,211.38, 1,817.10 and 345.70 is: 518.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.38 : 1,817.10 = 345.70 : x
  2. Step 2: Convert to fraction form
    1,211.38/1,817.10 = 345.70/x
  3. Step 3: Cross multiply
    1,211.38x = 1,817.10 × 345.70
  4. Step 4: Simplify right side
    1,211.38x = 628,171.47
  5. Step 5: Solve for x
    x = 628,171.47/1,211.38
  6. Step 6: Final answer
    x = 518.56

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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.