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Finding the Fourth Proportional to 18,659.28, 28,020.12 and 11,655.60

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Solution

The fourth proportional to 18,659.28, 28,020.12 and 11,655.60 is: 17,502.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.28 : 28,020.12 = 11,655.60 : x
  2. Step 2: Convert to fraction form
    18,659.28/28,020.12 = 11,655.60/x
  3. Step 3: Cross multiply
    18,659.28x = 28,020.12 × 11,655.60
  4. Step 4: Simplify right side
    18,659.28x = 326,591,310.67
  5. Step 5: Solve for x
    x = 326,591,310.67/18,659.28
  6. Step 6: Final answer
    x = 17,502.89

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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.