Home / 21,939.62-30,272.20-12,982.64

Finding the Fourth Proportional to 21,939.62, 30,272.20 and 12,982.64

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Solution

The fourth proportional to 21,939.62, 30,272.20 and 12,982.64 is: 17,913.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.62 : 30,272.20 = 12,982.64 : x
  2. Step 2: Convert to fraction form
    21,939.62/30,272.20 = 12,982.64/x
  3. Step 3: Cross multiply
    21,939.62x = 30,272.20 × 12,982.64
  4. Step 4: Simplify right side
    21,939.62x = 393,012,890.79
  5. Step 5: Solve for x
    x = 393,012,890.79/21,939.62
  6. Step 6: Final answer
    x = 17,913.39

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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.