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Finding the Fourth Proportional to 18,671.52, 28,012.47 and 8,142.47

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Solution

The fourth proportional to 18,671.52, 28,012.47 and 8,142.47 is: 12,215.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,671.52 : 28,012.47 = 8,142.47 : x
  2. Step 2: Convert to fraction form
    18,671.52/28,012.47 = 8,142.47/x
  3. Step 3: Cross multiply
    18,671.52x = 28,012.47 × 8,142.47
  4. Step 4: Simplify right side
    18,671.52x = 228,090,778.54
  5. Step 5: Solve for x
    x = 228,090,778.54/18,671.52
  6. Step 6: Final answer
    x = 12,215.97

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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.