Home / 20,930.20-28,881.82-12,431.68

Finding the Fourth Proportional to 20,930.20, 28,881.82 and 12,431.68

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Solution

The fourth proportional to 20,930.20, 28,881.82 and 12,431.68 is: 17,154.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.20 : 28,881.82 = 12,431.68 : x
  2. Step 2: Convert to fraction form
    20,930.20/28,881.82 = 12,431.68/x
  3. Step 3: Cross multiply
    20,930.20x = 28,881.82 × 12,431.68
  4. Step 4: Simplify right side
    20,930.20x = 359,049,544.06
  5. Step 5: Solve for x
    x = 359,049,544.06/20,930.20
  6. Step 6: Final answer
    x = 17,154.62

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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.