Home / 20,120.90-30,192.15-8,435.30

Finding the Fourth Proportional to 20,120.90, 30,192.15 and 8,435.30

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Solution

The fourth proportional to 20,120.90, 30,192.15 and 8,435.30 is: 12,657.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.90 : 30,192.15 = 8,435.30 : x
  2. Step 2: Convert to fraction form
    20,120.90/30,192.15 = 8,435.30/x
  3. Step 3: Cross multiply
    20,120.90x = 30,192.15 × 8,435.30
  4. Step 4: Simplify right side
    20,120.90x = 254,679,842.90
  5. Step 5: Solve for x
    x = 254,679,842.90/20,120.90
  6. Step 6: Final answer
    x = 12,657.48

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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.