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Finding the Fourth Proportional to 12,668.16, 18,991.99 and 5,278.17

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Solution

The fourth proportional to 12,668.16, 18,991.99 and 5,278.17 is: 7,912.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,668.16 : 18,991.99 = 5,278.17 : x
  2. Step 2: Convert to fraction form
    12,668.16/18,991.99 = 5,278.17/x
  3. Step 3: Cross multiply
    12,668.16x = 18,991.99 × 5,278.17
  4. Step 4: Simplify right side
    12,668.16x = 100,242,951.86
  5. Step 5: Solve for x
    x = 100,242,951.86/12,668.16
  6. Step 6: Final answer
    x = 7,912.98

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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.