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Finding the Fourth Proportional to 1,907.57, 2,861.36 and 812.85

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Solution

The fourth proportional to 1,907.57, 2,861.36 and 812.85 is: 1,219.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,907.57 : 2,861.36 = 812.85 : x
  2. Step 2: Convert to fraction form
    1,907.57/2,861.36 = 812.85/x
  3. Step 3: Cross multiply
    1,907.57x = 2,861.36 × 812.85
  4. Step 4: Simplify right side
    1,907.57x = 2,325,852.41
  5. Step 5: Solve for x
    x = 2,325,852.41/1,907.57
  6. Step 6: Final answer
    x = 1,219.28

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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.