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Finding the Fourth Proportional to 99,890.88, 137,855.79 and 57,448.50

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Solution

The fourth proportional to 99,890.88, 137,855.79 and 57,448.50 is: 79,282.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,890.88 : 137,855.79 = 57,448.50 : x
  2. Step 2: Convert to fraction form
    99,890.88/137,855.79 = 57,448.50/x
  3. Step 3: Cross multiply
    99,890.88x = 137,855.79 × 57,448.50
  4. Step 4: Simplify right side
    99,890.88x = 7,919,608,351.82
  5. Step 5: Solve for x
    x = 7,919,608,351.82/99,890.88
  6. Step 6: Final answer
    x = 79,282.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.