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Finding the Fourth Proportional to 99,979,576.80, 149,969,365.20 and 28,175,992.80

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Solution

The fourth proportional to 99,979,576.80, 149,969,365.20 and 28,175,992.80 is: 42,263,989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,979,576.80 : 149,969,365.20 = 28,175,992.80 : x
  2. Step 2: Convert to fraction form
    99,979,576.80/149,969,365.20 = 28,175,992.80/x
  3. Step 3: Cross multiply
    99,979,576.80x = 149,969,365.20 × 28,175,992.80
  4. Step 4: Simplify right side
    99,979,576.80x = 4,225,535,754,095,770.50
  5. Step 5: Solve for x
    x = 4,225,535,754,095,770.50/99,979,576.80
  6. Step 6: Final answer
    x = 42,263,989.20

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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.