Home / 20,520.86-30,781.58-13,545.54

Finding the Fourth Proportional to 20,520.86, 30,781.58 and 13,545.54

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Solution

The fourth proportional to 20,520.86, 30,781.58 and 13,545.54 is: 20,318.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520.86 : 30,781.58 = 13,545.54 : x
  2. Step 2: Convert to fraction form
    20,520.86/30,781.58 = 13,545.54/x
  3. Step 3: Cross multiply
    20,520.86x = 30,781.58 × 13,545.54
  4. Step 4: Simplify right side
    20,520.86x = 416,953,055.43
  5. Step 5: Solve for x
    x = 416,953,055.43/20,520.86
  6. Step 6: Final answer
    x = 20,318.50

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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.