Home / 20,205.12-30,305.31-5,415.30

Finding the Fourth Proportional to 20,205.12, 30,305.31 and 5,415.30

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Solution

The fourth proportional to 20,205.12, 30,305.31 and 5,415.30 is: 8,122.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,205.12 : 30,305.31 = 5,415.30 : x
  2. Step 2: Convert to fraction form
    20,205.12/30,305.31 = 5,415.30/x
  3. Step 3: Cross multiply
    20,205.12x = 30,305.31 × 5,415.30
  4. Step 4: Simplify right side
    20,205.12x = 164,112,345.24
  5. Step 5: Solve for x
    x = 164,112,345.24/20,205.12
  6. Step 6: Final answer
    x = 8,122.31

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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.