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Finding the Fourth Proportional to 18,961.20, 28,441.80 and 12,740.40

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Solution

The fourth proportional to 18,961.20, 28,441.80 and 12,740.40 is: 19,110.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.20 : 28,441.80 = 12,740.40 : x
  2. Step 2: Convert to fraction form
    18,961.20/28,441.80 = 12,740.40/x
  3. Step 3: Cross multiply
    18,961.20x = 28,441.80 × 12,740.40
  4. Step 4: Simplify right side
    18,961.20x = 362,359,908.72
  5. Step 5: Solve for x
    x = 362,359,908.72/18,961.20
  6. Step 6: Final answer
    x = 19,110.60

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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.