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Finding the Fourth Proportional to 18,918.14, 28,375.46 and 8,920.58

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Solution

The fourth proportional to 18,918.14, 28,375.46 and 8,920.58 is: 13,380.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.14 : 28,375.46 = 8,920.58 : x
  2. Step 2: Convert to fraction form
    18,918.14/28,375.46 = 8,920.58/x
  3. Step 3: Cross multiply
    18,918.14x = 28,375.46 × 8,920.58
  4. Step 4: Simplify right side
    18,918.14x = 253,125,516.36
  5. Step 5: Solve for x
    x = 253,125,516.36/18,918.14
  6. Step 6: Final answer
    x = 13,380.04

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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.