Home / 81,192,431.20-121,788,646.80-20,608,157.20

Finding the Fourth Proportional to 81,192,431.20, 121,788,646.80 and 20,608,157.20

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Solution

The fourth proportional to 81,192,431.20, 121,788,646.80 and 20,608,157.20 is: 30,912,235.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,192,431.20 : 121,788,646.80 = 20,608,157.20 : x
  2. Step 2: Convert to fraction form
    81,192,431.20/121,788,646.80 = 20,608,157.20/x
  3. Step 3: Cross multiply
    81,192,431.20x = 121,788,646.80 × 20,608,157.20
  4. Step 4: Simplify right side
    81,192,431.20x = 2,509,839,578,429,677
  5. Step 5: Solve for x
    x = 2,509,839,578,429,677/81,192,431.20
  6. Step 6: Final answer
    x = 30,912,235.80

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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.