Home / 20,921.69-28,872.08-11,968.64

Finding the Fourth Proportional to 20,921.69, 28,872.08 and 11,968.64

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Solution

The fourth proportional to 20,921.69, 28,872.08 and 11,968.64 is: 16,516.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.69 : 28,872.08 = 11,968.64 : x
  2. Step 2: Convert to fraction form
    20,921.69/28,872.08 = 11,968.64/x
  3. Step 3: Cross multiply
    20,921.69x = 28,872.08 × 11,968.64
  4. Step 4: Simplify right side
    20,921.69x = 345,559,417.13
  5. Step 5: Solve for x
    x = 345,559,417.13/20,921.69
  6. Step 6: Final answer
    x = 16,516.81

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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.