Home / 2,987.12-4,122.62-1,808.21

Finding the Fourth Proportional to 2,987.12, 4,122.62 and 1,808.21

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Solution

The fourth proportional to 2,987.12, 4,122.62 and 1,808.21 is: 2,495.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.12 : 4,122.62 = 1,808.21 : x
  2. Step 2: Convert to fraction form
    2,987.12/4,122.62 = 1,808.21/x
  3. Step 3: Cross multiply
    2,987.12x = 4,122.62 × 1,808.21
  4. Step 4: Simplify right side
    2,987.12x = 7,454,533.06
  5. Step 5: Solve for x
    x = 7,454,533.06/2,987.12
  6. Step 6: Final answer
    x = 2,495.56

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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.