Home / 20,990.07-28,972.08-14,286.92

Finding the Fourth Proportional to 20,990.07, 28,972.08 and 14,286.92

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Solution

The fourth proportional to 20,990.07, 28,972.08 and 14,286.92 is: 19,719.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.07 : 28,972.08 = 14,286.92 : x
  2. Step 2: Convert to fraction form
    20,990.07/28,972.08 = 14,286.92/x
  3. Step 3: Cross multiply
    20,990.07x = 28,972.08 × 14,286.92
  4. Step 4: Simplify right side
    20,990.07x = 413,921,644.33
  5. Step 5: Solve for x
    x = 413,921,644.33/20,990.07
  6. Step 6: Final answer
    x = 19,719.88

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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.