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Finding the Fourth Proportional to 20,980.08, 28,951.92 and 12,492

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Solution

The fourth proportional to 20,980.08, 28,951.92 and 12,492 is: 17,238.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.08 : 28,951.92 = 12,492 : x
  2. Step 2: Convert to fraction form
    20,980.08/28,951.92 = 12,492/x
  3. Step 3: Cross multiply
    20,980.08x = 28,951.92 × 12,492
  4. Step 4: Simplify right side
    20,980.08x = 361,667,384.64
  5. Step 5: Solve for x
    x = 361,667,384.64/20,980.08
  6. Step 6: Final answer
    x = 17,238.61

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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.