Home / 12,135.20-18,202.80-4,739.90

Finding the Fourth Proportional to 12,135.20, 18,202.80 and 4,739.90

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Solution

The fourth proportional to 12,135.20, 18,202.80 and 4,739.90 is: 7,109.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.20 : 18,202.80 = 4,739.90 : x
  2. Step 2: Convert to fraction form
    12,135.20/18,202.80 = 4,739.90/x
  3. Step 3: Cross multiply
    12,135.20x = 18,202.80 × 4,739.90
  4. Step 4: Simplify right side
    12,135.20x = 86,279,451.72
  5. Step 5: Solve for x
    x = 86,279,451.72/12,135.20
  6. Step 6: Final answer
    x = 7,109.85

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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.