Home / 20,988.42-28,960.95-11,912.37

Finding the Fourth Proportional to 20,988.42, 28,960.95 and 11,912.37

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Solution

The fourth proportional to 20,988.42, 28,960.95 and 11,912.37 is: 16,437.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.42 : 28,960.95 = 11,912.37 : x
  2. Step 2: Convert to fraction form
    20,988.42/28,960.95 = 11,912.37/x
  3. Step 3: Cross multiply
    20,988.42x = 28,960.95 × 11,912.37
  4. Step 4: Simplify right side
    20,988.42x = 344,993,551.95
  5. Step 5: Solve for x
    x = 344,993,551.95/20,988.42
  6. Step 6: Final answer
    x = 16,437.33

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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.