Home / 20,138.12-30,203.40-6,987.80

Finding the Fourth Proportional to 20,138.12, 30,203.40 and 6,987.80

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Solution

The fourth proportional to 20,138.12, 30,203.40 and 6,987.80 is: 10,480.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.12 : 30,203.40 = 6,987.80 : x
  2. Step 2: Convert to fraction form
    20,138.12/30,203.40 = 6,987.80/x
  3. Step 3: Cross multiply
    20,138.12x = 30,203.40 × 6,987.80
  4. Step 4: Simplify right side
    20,138.12x = 211,055,318.52
  5. Step 5: Solve for x
    x = 211,055,318.52/20,138.12
  6. Step 6: Final answer
    x = 10,480.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.