Home / 20,981.12-28,953.60-13,912.48

Finding the Fourth Proportional to 20,981.12, 28,953.60 and 13,912.48

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Solution

The fourth proportional to 20,981.12, 28,953.60 and 13,912.48 is: 19,198.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.12 : 28,953.60 = 13,912.48 : x
  2. Step 2: Convert to fraction form
    20,981.12/28,953.60 = 13,912.48/x
  3. Step 3: Cross multiply
    20,981.12x = 28,953.60 × 13,912.48
  4. Step 4: Simplify right side
    20,981.12x = 402,816,380.93
  5. Step 5: Solve for x
    x = 402,816,380.93/20,981.12
  6. Step 6: Final answer
    x = 19,198.99

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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.