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Finding the Fourth Proportional to 18,918.83, 28,378.09 and 7,075.59

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Solution

The fourth proportional to 18,918.83, 28,378.09 and 7,075.59 is: 10,613.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.83 : 28,378.09 = 7,075.59 : x
  2. Step 2: Convert to fraction form
    18,918.83/28,378.09 = 7,075.59/x
  3. Step 3: Cross multiply
    18,918.83x = 28,378.09 × 7,075.59
  4. Step 4: Simplify right side
    18,918.83x = 200,791,729.82
  5. Step 5: Solve for x
    x = 200,791,729.82/18,918.83
  6. Step 6: Final answer
    x = 10,613.33

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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.