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Finding the Fourth Proportional to 99,805.72, 149,786.80 and 69,623.64

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Solution

The fourth proportional to 99,805.72, 149,786.80 and 69,623.64 is: 104,490.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,805.72 : 149,786.80 = 69,623.64 : x
  2. Step 2: Convert to fraction form
    99,805.72/149,786.80 = 69,623.64/x
  3. Step 3: Cross multiply
    99,805.72x = 149,786.80 × 69,623.64
  4. Step 4: Simplify right side
    99,805.72x = 10,428,702,239.95
  5. Step 5: Solve for x
    x = 10,428,702,239.95/99,805.72
  6. Step 6: Final answer
    x = 104,490.03

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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.