Home / 20,106.20-30,153.90-8,420.60

Finding the Fourth Proportional to 20,106.20, 30,153.90 and 8,420.60

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Solution

The fourth proportional to 20,106.20, 30,153.90 and 8,420.60 is: 12,628.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,106.20 : 30,153.90 = 8,420.60 : x
  2. Step 2: Convert to fraction form
    20,106.20/30,153.90 = 8,420.60/x
  3. Step 3: Cross multiply
    20,106.20x = 30,153.90 × 8,420.60
  4. Step 4: Simplify right side
    20,106.20x = 253,913,930.34
  5. Step 5: Solve for x
    x = 253,913,930.34/20,106.20
  6. Step 6: Final answer
    x = 12,628.64

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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.