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Finding the Fourth Proportional to 99,891.69, 137,967.55 and 79,541.88

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Solution

The fourth proportional to 99,891.69, 137,967.55 and 79,541.88 is: 109,860.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,891.69 : 137,967.55 = 79,541.88 : x
  2. Step 2: Convert to fraction form
    99,891.69/137,967.55 = 79,541.88/x
  3. Step 3: Cross multiply
    99,891.69x = 137,967.55 × 79,541.88
  4. Step 4: Simplify right side
    99,891.69x = 10,974,198,305.99
  5. Step 5: Solve for x
    x = 10,974,198,305.99/99,891.69
  6. Step 6: Final answer
    x = 109,860.97

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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.