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Finding the Fourth Proportional to 18,994.20, 28,512.90 and 11,207.40

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Solution

The fourth proportional to 18,994.20, 28,512.90 and 11,207.40 is: 16,823.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,994.20 : 28,512.90 = 11,207.40 : x
  2. Step 2: Convert to fraction form
    18,994.20/28,512.90 = 11,207.40/x
  3. Step 3: Cross multiply
    18,994.20x = 28,512.90 × 11,207.40
  4. Step 4: Simplify right side
    18,994.20x = 319,555,475.46
  5. Step 5: Solve for x
    x = 319,555,475.46/18,994.20
  6. Step 6: Final answer
    x = 16,823.84

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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.