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Finding the Fourth Proportional to 28,659.89, 42,976 and 12,015.45

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Solution

The fourth proportional to 28,659.89, 42,976 and 12,015.45 is: 18,017.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,659.89 : 42,976 = 12,015.45 : x
  2. Step 2: Convert to fraction form
    28,659.89/42,976 = 12,015.45/x
  3. Step 3: Cross multiply
    28,659.89x = 42,976 × 12,015.45
  4. Step 4: Simplify right side
    28,659.89x = 516,375,979.20
  5. Step 5: Solve for x
    x = 516,375,979.20/28,659.89
  6. Step 6: Final answer
    x = 18,017.37

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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.