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Finding the Fourth Proportional to 20,643.92, 28,488.84 and 12,147.92

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Solution

The fourth proportional to 20,643.92, 28,488.84 and 12,147.92 is: 16,764.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.92 : 28,488.84 = 12,147.92 : x
  2. Step 2: Convert to fraction form
    20,643.92/28,488.84 = 12,147.92/x
  3. Step 3: Cross multiply
    20,643.92x = 28,488.84 × 12,147.92
  4. Step 4: Simplify right side
    20,643.92x = 346,080,149.21
  5. Step 5: Solve for x
    x = 346,080,149.21/20,643.92
  6. Step 6: Final answer
    x = 16,764.27

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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.