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Finding the Fourth Proportional to 18,687.47, 28,007.54 and 8,154.68

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Solution

The fourth proportional to 18,687.47, 28,007.54 and 8,154.68 is: 12,221.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.47 : 28,007.54 = 8,154.68 : x
  2. Step 2: Convert to fraction form
    18,687.47/28,007.54 = 8,154.68/x
  3. Step 3: Cross multiply
    18,687.47x = 28,007.54 × 8,154.68
  4. Step 4: Simplify right side
    18,687.47x = 228,392,345.48
  5. Step 5: Solve for x
    x = 228,392,345.48/18,687.47
  6. Step 6: Final answer
    x = 12,221.68

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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.