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Finding the Fourth Proportional to 2,080.40, 3,121.12 and 619.55

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Solution

The fourth proportional to 2,080.40, 3,121.12 and 619.55 is: 929.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.40 : 3,121.12 = 619.55 : x
  2. Step 2: Convert to fraction form
    2,080.40/3,121.12 = 619.55/x
  3. Step 3: Cross multiply
    2,080.40x = 3,121.12 × 619.55
  4. Step 4: Simplify right side
    2,080.40x = 1,933,689.90
  5. Step 5: Solve for x
    x = 1,933,689.90/2,080.40
  6. Step 6: Final answer
    x = 929.48

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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.