Home / 1,211.60-1,817.36-345.90

Finding the Fourth Proportional to 1,211.60, 1,817.36 and 345.90

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Solution

The fourth proportional to 1,211.60, 1,817.36 and 345.90 is: 518.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.60 : 1,817.36 = 345.90 : x
  2. Step 2: Convert to fraction form
    1,211.60/1,817.36 = 345.90/x
  3. Step 3: Cross multiply
    1,211.60x = 1,817.36 × 345.90
  4. Step 4: Simplify right side
    1,211.60x = 628,624.82
  5. Step 5: Solve for x
    x = 628,624.82/1,211.60
  6. Step 6: Final answer
    x = 518.84

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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.