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Finding the Fourth Proportional to 2,070.12, 3,105 and 838.20

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Solution

The fourth proportional to 2,070.12, 3,105 and 838.20 is: 1,257.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,070.12 : 3,105 = 838.20 : x
  2. Step 2: Convert to fraction form
    2,070.12/3,105 = 838.20/x
  3. Step 3: Cross multiply
    2,070.12x = 3,105 × 838.20
  4. Step 4: Simplify right side
    2,070.12x = 2,602,611
  5. Step 5: Solve for x
    x = 2,602,611/2,070.12
  6. Step 6: Final answer
    x = 1,257.23

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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.