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Finding the Fourth Proportional to 28,978,007.80, 43,467,011.70 and 18,900,311.80

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Solution

The fourth proportional to 28,978,007.80, 43,467,011.70 and 18,900,311.80 is: 28,350,467.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978,007.80 : 43,467,011.70 = 18,900,311.80 : x
  2. Step 2: Convert to fraction form
    28,978,007.80/43,467,011.70 = 18,900,311.80/x
  3. Step 3: Cross multiply
    28,978,007.80x = 43,467,011.70 × 18,900,311.80
  4. Step 4: Simplify right side
    28,978,007.80x = 821,540,074,144,248.12
  5. Step 5: Solve for x
    x = 821,540,074,144,248.12/28,978,007.80
  6. Step 6: Final answer
    x = 28,350,467.70

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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.