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Finding the Fourth Proportional to 7,980.91, 11,981.97 and 6,818.38

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Solution

The fourth proportional to 7,980.91, 11,981.97 and 6,818.38 is: 10,236.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.91 : 11,981.97 = 6,818.38 : x
  2. Step 2: Convert to fraction form
    7,980.91/11,981.97 = 6,818.38/x
  3. Step 3: Cross multiply
    7,980.91x = 11,981.97 × 6,818.38
  4. Step 4: Simplify right side
    7,980.91x = 81,697,590.52
  5. Step 5: Solve for x
    x = 81,697,590.52/7,980.91
  6. Step 6: Final answer
    x = 10,236.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.