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Finding the Fourth Proportional to 19,279.80, 28,919.70 and 11,892.60

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Solution

The fourth proportional to 19,279.80, 28,919.70 and 11,892.60 is: 17,838.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,279.80 : 28,919.70 = 11,892.60 : x
  2. Step 2: Convert to fraction form
    19,279.80/28,919.70 = 11,892.60/x
  3. Step 3: Cross multiply
    19,279.80x = 28,919.70 × 11,892.60
  4. Step 4: Simplify right side
    19,279.80x = 343,930,424.22
  5. Step 5: Solve for x
    x = 343,930,424.22/19,279.80
  6. Step 6: Final answer
    x = 17,838.90

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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.