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Finding the Fourth Proportional to 18,939.86, 28,387.10 and 13,384.88

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Solution

The fourth proportional to 18,939.86, 28,387.10 and 13,384.88 is: 20,061.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.86 : 28,387.10 = 13,384.88 : x
  2. Step 2: Convert to fraction form
    18,939.86/28,387.10 = 13,384.88/x
  3. Step 3: Cross multiply
    18,939.86x = 28,387.10 × 13,384.88
  4. Step 4: Simplify right side
    18,939.86x = 379,957,927.05
  5. Step 5: Solve for x
    x = 379,957,927.05/18,939.86
  6. Step 6: Final answer
    x = 20,061.28

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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.