Home / 2,987.06-4,119.24-1,978.30

Finding the Fourth Proportional to 2,987.06, 4,119.24 and 1,978.30

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Solution

The fourth proportional to 2,987.06, 4,119.24 and 1,978.30 is: 2,728.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.06 : 4,119.24 = 1,978.30 : x
  2. Step 2: Convert to fraction form
    2,987.06/4,119.24 = 1,978.30/x
  3. Step 3: Cross multiply
    2,987.06x = 4,119.24 × 1,978.30
  4. Step 4: Simplify right side
    2,987.06x = 8,149,092.49
  5. Step 5: Solve for x
    x = 8,149,092.49/2,987.06
  6. Step 6: Final answer
    x = 2,728.13

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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.