Home / 20,586.20-28,409.60-13,420.73

Finding the Fourth Proportional to 20,586.20, 28,409.60 and 13,420.73

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Solution

The fourth proportional to 20,586.20, 28,409.60 and 13,420.73 is: 18,521.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,586.20 : 28,409.60 = 13,420.73 : x
  2. Step 2: Convert to fraction form
    20,586.20/28,409.60 = 13,420.73/x
  3. Step 3: Cross multiply
    20,586.20x = 28,409.60 × 13,420.73
  4. Step 4: Simplify right side
    20,586.20x = 381,277,361.86
  5. Step 5: Solve for x
    x = 381,277,361.86/20,586.20
  6. Step 6: Final answer
    x = 18,521.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.