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Finding the Fourth Proportional to 18,957.34, 28,401.96 and 11,161.90

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Solution

The fourth proportional to 18,957.34, 28,401.96 and 11,161.90 is: 16,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.34 : 28,401.96 = 11,161.90 : x
  2. Step 2: Convert to fraction form
    18,957.34/28,401.96 = 11,161.90/x
  3. Step 3: Cross multiply
    18,957.34x = 28,401.96 × 11,161.90
  4. Step 4: Simplify right side
    18,957.34x = 317,019,837.32
  5. Step 5: Solve for x
    x = 317,019,837.32/18,957.34
  6. Step 6: Final answer
    x = 16,722.80

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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.