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Finding the Fourth Proportional to 18,975.20, 28,484.40 and 11,188.40

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Solution

The fourth proportional to 18,975.20, 28,484.40 and 11,188.40 is: 16,795.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,975.20 : 28,484.40 = 11,188.40 : x
  2. Step 2: Convert to fraction form
    18,975.20/28,484.40 = 11,188.40/x
  3. Step 3: Cross multiply
    18,975.20x = 28,484.40 × 11,188.40
  4. Step 4: Simplify right side
    18,975.20x = 318,694,860.96
  5. Step 5: Solve for x
    x = 318,694,860.96/18,975.20
  6. Step 6: Final answer
    x = 16,795.34

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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.