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Finding the Fourth Proportional to 2,080.85, 3,121.34 and 782.01

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Solution

The fourth proportional to 2,080.85, 3,121.34 and 782.01 is: 1,173.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.85 : 3,121.34 = 782.01 : x
  2. Step 2: Convert to fraction form
    2,080.85/3,121.34 = 782.01/x
  3. Step 3: Cross multiply
    2,080.85x = 3,121.34 × 782.01
  4. Step 4: Simplify right side
    2,080.85x = 2,440,915.18
  5. Step 5: Solve for x
    x = 2,440,915.18/2,080.85
  6. Step 6: Final answer
    x = 1,173.04

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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.