Home / 2,118.70-3,190.16-1,989.10

Finding the Fourth Proportional to 2,118.70, 3,190.16 and 1,989.10

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Solution

The fourth proportional to 2,118.70, 3,190.16 and 1,989.10 is: 2,995.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.70 : 3,190.16 = 1,989.10 : x
  2. Step 2: Convert to fraction form
    2,118.70/3,190.16 = 1,989.10/x
  3. Step 3: Cross multiply
    2,118.70x = 3,190.16 × 1,989.10
  4. Step 4: Simplify right side
    2,118.70x = 6,345,547.26
  5. Step 5: Solve for x
    x = 6,345,547.26/2,118.70
  6. Step 6: Final answer
    x = 2,995.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.