Home / 20,153.20-30,229.80-12,790.30

Finding the Fourth Proportional to 20,153.20, 30,229.80 and 12,790.30

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Solution

The fourth proportional to 20,153.20, 30,229.80 and 12,790.30 is: 19,185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,153.20 : 30,229.80 = 12,790.30 : x
  2. Step 2: Convert to fraction form
    20,153.20/30,229.80 = 12,790.30/x
  3. Step 3: Cross multiply
    20,153.20x = 30,229.80 × 12,790.30
  4. Step 4: Simplify right side
    20,153.20x = 386,648,210.94
  5. Step 5: Solve for x
    x = 386,648,210.94/20,153.20
  6. Step 6: Final answer
    x = 19,185.45

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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.