Home / 20,989.63-28,963.49-11,912.10

Finding the Fourth Proportional to 20,989.63, 28,963.49 and 11,912.10

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Solution

The fourth proportional to 20,989.63, 28,963.49 and 11,912.10 is: 16,437.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.63 : 28,963.49 = 11,912.10 : x
  2. Step 2: Convert to fraction form
    20,989.63/28,963.49 = 11,912.10/x
  3. Step 3: Cross multiply
    20,989.63x = 28,963.49 × 11,912.10
  4. Step 4: Simplify right side
    20,989.63x = 345,016,145.72
  5. Step 5: Solve for x
    x = 345,016,145.72/20,989.63
  6. Step 6: Final answer
    x = 16,437.45

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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.