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Finding the Fourth Proportional to 1,912.12, 2,865.60 and 816.18

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Solution

The fourth proportional to 1,912.12, 2,865.60 and 816.18 is: 1,223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.12 : 2,865.60 = 816.18 : x
  2. Step 2: Convert to fraction form
    1,912.12/2,865.60 = 816.18/x
  3. Step 3: Cross multiply
    1,912.12x = 2,865.60 × 816.18
  4. Step 4: Simplify right side
    1,912.12x = 2,338,845.41
  5. Step 5: Solve for x
    x = 2,338,845.41/1,912.12
  6. Step 6: Final answer
    x = 1,223.17

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1.5x scale

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.