Home / 20,419.60-28,176.78-11,465.86

Finding the Fourth Proportional to 20,419.60, 28,176.78 and 11,465.86

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Solution

The fourth proportional to 20,419.60, 28,176.78 and 11,465.86 is: 15,821.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,419.60 : 28,176.78 = 11,465.86 : x
  2. Step 2: Convert to fraction form
    20,419.60/28,176.78 = 11,465.86/x
  3. Step 3: Cross multiply
    20,419.60x = 28,176.78 × 11,465.86
  4. Step 4: Simplify right side
    20,419.60x = 323,071,014.73
  5. Step 5: Solve for x
    x = 323,071,014.73/20,419.60
  6. Step 6: Final answer
    x = 15,821.61

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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.