Home / 2,187.16-3,018.28-1,290.90

Finding the Fourth Proportional to 2,187.16, 3,018.28 and 1,290.90

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Solution

The fourth proportional to 2,187.16, 3,018.28 and 1,290.90 is: 1,781.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.16 : 3,018.28 = 1,290.90 : x
  2. Step 2: Convert to fraction form
    2,187.16/3,018.28 = 1,290.90/x
  3. Step 3: Cross multiply
    2,187.16x = 3,018.28 × 1,290.90
  4. Step 4: Simplify right side
    2,187.16x = 3,896,297.65
  5. Step 5: Solve for x
    x = 3,896,297.65/2,187.16
  6. Step 6: Final answer
    x = 1,781.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.