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Finding the Fourth Proportional to 20,673.40, 28,530.12 and 11,722

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Solution

The fourth proportional to 20,673.40, 28,530.12 and 11,722 is: 16,176.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,673.40 : 28,530.12 = 11,722 : x
  2. Step 2: Convert to fraction form
    20,673.40/28,530.12 = 11,722/x
  3. Step 3: Cross multiply
    20,673.40x = 28,530.12 × 11,722
  4. Step 4: Simplify right side
    20,673.40x = 334,430,066.64
  5. Step 5: Solve for x
    x = 334,430,066.64/20,673.40
  6. Step 6: Final answer
    x = 16,176.83

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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.