Home / 2,090.20-3,131.10-1,307.80

Finding the Fourth Proportional to 2,090.20, 3,131.10 and 1,307.80

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Solution

The fourth proportional to 2,090.20, 3,131.10 and 1,307.80 is: 1,959.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,090.20 : 3,131.10 = 1,307.80 : x
  2. Step 2: Convert to fraction form
    2,090.20/3,131.10 = 1,307.80/x
  3. Step 3: Cross multiply
    2,090.20x = 3,131.10 × 1,307.80
  4. Step 4: Simplify right side
    2,090.20x = 4,094,852.58
  5. Step 5: Solve for x
    x = 4,094,852.58/2,090.20
  6. Step 6: Final answer
    x = 1,959.07

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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.