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Finding the Fourth Proportional to 66,649.40, 99,991.42 and 19,902.26

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Solution

The fourth proportional to 66,649.40, 99,991.42 and 19,902.26 is: 29,858.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,649.40 : 99,991.42 = 19,902.26 : x
  2. Step 2: Convert to fraction form
    66,649.40/99,991.42 = 19,902.26/x
  3. Step 3: Cross multiply
    66,649.40x = 99,991.42 × 19,902.26
  4. Step 4: Simplify right side
    66,649.40x = 1,990,055,238.61
  5. Step 5: Solve for x
    x = 1,990,055,238.61/66,649.40
  6. Step 6: Final answer
    x = 29,858.56

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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.