Home / 20,139.56-30,209.34-7,830.44

Finding the Fourth Proportional to 20,139.56, 30,209.34 and 7,830.44

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Solution

The fourth proportional to 20,139.56, 30,209.34 and 7,830.44 is: 11,745.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.56 : 30,209.34 = 7,830.44 : x
  2. Step 2: Convert to fraction form
    20,139.56/30,209.34 = 7,830.44/x
  3. Step 3: Cross multiply
    20,139.56x = 30,209.34 × 7,830.44
  4. Step 4: Simplify right side
    20,139.56x = 236,552,424.31
  5. Step 5: Solve for x
    x = 236,552,424.31/20,139.56
  6. Step 6: Final answer
    x = 11,745.66

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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.