Home / 2,108.90-3,161.70-1,287.02

Finding the Fourth Proportional to 2,108.90, 3,161.70 and 1,287.02

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Solution

The fourth proportional to 2,108.90, 3,161.70 and 1,287.02 is: 1,929.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.90 : 3,161.70 = 1,287.02 : x
  2. Step 2: Convert to fraction form
    2,108.90/3,161.70 = 1,287.02/x
  3. Step 3: Cross multiply
    2,108.90x = 3,161.70 × 1,287.02
  4. Step 4: Simplify right side
    2,108.90x = 4,069,171.13
  5. Step 5: Solve for x
    x = 4,069,171.13/2,108.90
  6. Step 6: Final answer
    x = 1,929.52

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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.