Home / 2,987.16-4,121.66-1,808

Finding the Fourth Proportional to 2,987.16, 4,121.66 and 1,808

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Solution

The fourth proportional to 2,987.16, 4,121.66 and 1,808 is: 2,494.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.16 : 4,121.66 = 1,808 : x
  2. Step 2: Convert to fraction form
    2,987.16/4,121.66 = 1,808/x
  3. Step 3: Cross multiply
    2,987.16x = 4,121.66 × 1,808
  4. Step 4: Simplify right side
    2,987.16x = 7,451,961.28
  5. Step 5: Solve for x
    x = 7,451,961.28/2,987.16
  6. Step 6: Final answer
    x = 2,494.66

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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.