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Finding the Fourth Proportional to 19,278.80, 28,918.20 and 11,891.60

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Solution

The fourth proportional to 19,278.80, 28,918.20 and 11,891.60 is: 17,837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,278.80 : 28,918.20 = 11,891.60 : x
  2. Step 2: Convert to fraction form
    19,278.80/28,918.20 = 11,891.60/x
  3. Step 3: Cross multiply
    19,278.80x = 28,918.20 × 11,891.60
  4. Step 4: Simplify right side
    19,278.80x = 343,883,667.12
  5. Step 5: Solve for x
    x = 343,883,667.12/19,278.80
  6. Step 6: Final answer
    x = 17,837.40

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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.