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Finding the Fourth Proportional to 28,717.76, 43,079.72 and 12,079.49

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Solution

The fourth proportional to 28,717.76, 43,079.72 and 12,079.49 is: 18,120.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,717.76 : 43,079.72 = 12,079.49 : x
  2. Step 2: Convert to fraction form
    28,717.76/43,079.72 = 12,079.49/x
  3. Step 3: Cross multiply
    28,717.76x = 43,079.72 × 12,079.49
  4. Step 4: Simplify right side
    28,717.76x = 520,380,771.15
  5. Step 5: Solve for x
    x = 520,380,771.15/28,717.76
  6. Step 6: Final answer
    x = 18,120.52

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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.