Home / 20,431.88-28,198.60-12,472.40

Finding the Fourth Proportional to 20,431.88, 28,198.60 and 12,472.40

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Solution

The fourth proportional to 20,431.88, 28,198.60 and 12,472.40 is: 17,213.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,431.88 : 28,198.60 = 12,472.40 : x
  2. Step 2: Convert to fraction form
    20,431.88/28,198.60 = 12,472.40/x
  3. Step 3: Cross multiply
    20,431.88x = 28,198.60 × 12,472.40
  4. Step 4: Simplify right side
    20,431.88x = 351,704,218.64
  5. Step 5: Solve for x
    x = 351,704,218.64/20,431.88
  6. Step 6: Final answer
    x = 17,213.50

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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.