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Finding the Fourth Proportional to 18,891.63, 28,288.04 and 12,641.67

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Solution

The fourth proportional to 18,891.63, 28,288.04 and 12,641.67 is: 18,929.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.63 : 28,288.04 = 12,641.67 : x
  2. Step 2: Convert to fraction form
    18,891.63/28,288.04 = 12,641.67/x
  3. Step 3: Cross multiply
    18,891.63x = 28,288.04 × 12,641.67
  4. Step 4: Simplify right side
    18,891.63x = 357,608,003.42
  5. Step 5: Solve for x
    x = 357,608,003.42/18,891.63
  6. Step 6: Final answer
    x = 18,929.44

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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.