Home / 20,971.07-28,939.85-11,898.09

Finding the Fourth Proportional to 20,971.07, 28,939.85 and 11,898.09

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Solution

The fourth proportional to 20,971.07, 28,939.85 and 11,898.09 is: 16,419.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.07 : 28,939.85 = 11,898.09 : x
  2. Step 2: Convert to fraction form
    20,971.07/28,939.85 = 11,898.09/x
  3. Step 3: Cross multiply
    20,971.07x = 28,939.85 × 11,898.09
  4. Step 4: Simplify right side
    20,971.07x = 344,328,880.40
  5. Step 5: Solve for x
    x = 344,328,880.40/20,971.07
  6. Step 6: Final answer
    x = 16,419.24

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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.