Home / 20,940.35-28,885.99-12,868.40

Finding the Fourth Proportional to 20,940.35, 28,885.99 and 12,868.40

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Solution

The fourth proportional to 20,940.35, 28,885.99 and 12,868.40 is: 17,751.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.35 : 28,885.99 = 12,868.40 : x
  2. Step 2: Convert to fraction form
    20,940.35/28,885.99 = 12,868.40/x
  3. Step 3: Cross multiply
    20,940.35x = 28,885.99 × 12,868.40
  4. Step 4: Simplify right side
    20,940.35x = 371,716,473.72
  5. Step 5: Solve for x
    x = 371,716,473.72/20,940.35
  6. Step 6: Final answer
    x = 17,751.21

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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.