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Finding the Fourth Proportional to 28,080.62, 42,120.81 and 8,359.20

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Solution

The fourth proportional to 28,080.62, 42,120.81 and 8,359.20 is: 12,538.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,080.62 : 42,120.81 = 8,359.20 : x
  2. Step 2: Convert to fraction form
    28,080.62/42,120.81 = 8,359.20/x
  3. Step 3: Cross multiply
    28,080.62x = 42,120.81 × 8,359.20
  4. Step 4: Simplify right side
    28,080.62x = 352,096,274.95
  5. Step 5: Solve for x
    x = 352,096,274.95/28,080.62
  6. Step 6: Final answer
    x = 12,538.76

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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.