Home / 20,309.40-30,420.36-12,900.96

Finding the Fourth Proportional to 20,309.40, 30,420.36 and 12,900.96

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Solution

The fourth proportional to 20,309.40, 30,420.36 and 12,900.96 is: 19,323.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,309.40 : 30,420.36 = 12,900.96 : x
  2. Step 2: Convert to fraction form
    20,309.40/30,420.36 = 12,900.96/x
  3. Step 3: Cross multiply
    20,309.40x = 30,420.36 × 12,900.96
  4. Step 4: Simplify right side
    20,309.40x = 392,451,847.55
  5. Step 5: Solve for x
    x = 392,451,847.55/20,309.40
  6. Step 6: Final answer
    x = 19,323.66

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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.