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Finding the Fourth Proportional to 21,007.49, 28,990 and 11,576.39

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Solution

The fourth proportional to 21,007.49, 28,990 and 11,576.39 is: 15,975.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.49 : 28,990 = 11,576.39 : x
  2. Step 2: Convert to fraction form
    21,007.49/28,990 = 11,576.39/x
  3. Step 3: Cross multiply
    21,007.49x = 28,990 × 11,576.39
  4. Step 4: Simplify right side
    21,007.49x = 335,599,546.10
  5. Step 5: Solve for x
    x = 335,599,546.10/21,007.49
  6. Step 6: Final answer
    x = 15,975.23

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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.