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Finding the Fourth Proportional to 28,820.70, 43,121.70 and 18,979.20

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Solution

The fourth proportional to 28,820.70, 43,121.70 and 18,979.20 is: 28,396.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,820.70 : 43,121.70 = 18,979.20 : x
  2. Step 2: Convert to fraction form
    28,820.70/43,121.70 = 18,979.20/x
  3. Step 3: Cross multiply
    28,820.70x = 43,121.70 × 18,979.20
  4. Step 4: Simplify right side
    28,820.70x = 818,415,368.64
  5. Step 5: Solve for x
    x = 818,415,368.64/28,820.70
  6. Step 6: Final answer
    x = 28,396.79

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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.