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Finding the Fourth Proportional to 71,985,769.20, 107,978,653.80 and 18,133,081.20

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Solution

The fourth proportional to 71,985,769.20, 107,978,653.80 and 18,133,081.20 is: 27,199,621.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,985,769.20 : 107,978,653.80 = 18,133,081.20 : x
  2. Step 2: Convert to fraction form
    71,985,769.20/107,978,653.80 = 18,133,081.20/x
  3. Step 3: Cross multiply
    71,985,769.20x = 107,978,653.80 × 18,133,081.20
  4. Step 4: Simplify right side
    71,985,769.20x = 1,957,985,697,222,088.50
  5. Step 5: Solve for x
    x = 1,957,985,697,222,088.50/71,985,769.20
  6. Step 6: Final answer
    x = 27,199,621.80

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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.