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Finding the Fourth Proportional to 18,886.64, 28,330.92 and 7,200.78

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Solution

The fourth proportional to 18,886.64, 28,330.92 and 7,200.78 is: 10,801.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,886.64 : 28,330.92 = 7,200.78 : x
  2. Step 2: Convert to fraction form
    18,886.64/28,330.92 = 7,200.78/x
  3. Step 3: Cross multiply
    18,886.64x = 28,330.92 × 7,200.78
  4. Step 4: Simplify right side
    18,886.64x = 204,004,722.12
  5. Step 5: Solve for x
    x = 204,004,722.12/18,886.64
  6. Step 6: Final answer
    x = 10,801.54

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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.