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Finding the Fourth Proportional to 18,390.47, 27,581.60 and 8,528.47

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Solution

The fourth proportional to 18,390.47, 27,581.60 and 8,528.47 is: 12,790.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.47 : 27,581.60 = 8,528.47 : x
  2. Step 2: Convert to fraction form
    18,390.47/27,581.60 = 8,528.47/x
  3. Step 3: Cross multiply
    18,390.47x = 27,581.60 × 8,528.47
  4. Step 4: Simplify right side
    18,390.47x = 235,228,800.52
  5. Step 5: Solve for x
    x = 235,228,800.52/18,390.47
  6. Step 6: Final answer
    x = 12,790.80

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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.