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Finding the Fourth Proportional to 20,871.62, 28,804.89 and 11,920.47

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Solution

The fourth proportional to 20,871.62, 28,804.89 and 11,920.47 is: 16,451.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.62 : 28,804.89 = 11,920.47 : x
  2. Step 2: Convert to fraction form
    20,871.62/28,804.89 = 11,920.47/x
  3. Step 3: Cross multiply
    20,871.62x = 28,804.89 × 11,920.47
  4. Step 4: Simplify right side
    20,871.62x = 343,367,827.10
  5. Step 5: Solve for x
    x = 343,367,827.10/20,871.62
  6. Step 6: Final answer
    x = 16,451.42

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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.