Home / 20,989.19-28,964.94-11,428.40

Finding the Fourth Proportional to 20,989.19, 28,964.94 and 11,428.40

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Solution

The fourth proportional to 20,989.19, 28,964.94 and 11,428.40 is: 15,771.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.19 : 28,964.94 = 11,428.40 : x
  2. Step 2: Convert to fraction form
    20,989.19/28,964.94 = 11,428.40/x
  3. Step 3: Cross multiply
    20,989.19x = 28,964.94 × 11,428.40
  4. Step 4: Simplify right side
    20,989.19x = 331,022,920.30
  5. Step 5: Solve for x
    x = 331,022,920.30/20,989.19
  6. Step 6: Final answer
    x = 15,771.11

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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.