Home / 20,980.18-28,951.79-12,021.45

Finding the Fourth Proportional to 20,980.18, 28,951.79 and 12,021.45

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Solution

The fourth proportional to 20,980.18, 28,951.79 and 12,021.45 is: 16,589.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.18 : 28,951.79 = 12,021.45 : x
  2. Step 2: Convert to fraction form
    20,980.18/28,951.79 = 12,021.45/x
  3. Step 3: Cross multiply
    20,980.18x = 28,951.79 × 12,021.45
  4. Step 4: Simplify right side
    20,980.18x = 348,042,495.90
  5. Step 5: Solve for x
    x = 348,042,495.90/20,980.18
  6. Step 6: Final answer
    x = 16,589.11

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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.