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Finding the Fourth Proportional to 19,209.80, 28,814.70 and 18,918.20

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Solution

The fourth proportional to 19,209.80, 28,814.70 and 18,918.20 is: 28,377.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.80 : 28,814.70 = 18,918.20 : x
  2. Step 2: Convert to fraction form
    19,209.80/28,814.70 = 18,918.20/x
  3. Step 3: Cross multiply
    19,209.80x = 28,814.70 × 18,918.20
  4. Step 4: Simplify right side
    19,209.80x = 545,122,257.54
  5. Step 5: Solve for x
    x = 545,122,257.54/19,209.80
  6. Step 6: Final answer
    x = 28,377.30

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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.