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Finding the Fourth Proportional to 66,419.79, 99,611.45 and 39,744.79

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Solution

The fourth proportional to 66,419.79, 99,611.45 and 39,744.79 is: 59,606.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,419.79 : 99,611.45 = 39,744.79 : x
  2. Step 2: Convert to fraction form
    66,419.79/99,611.45 = 39,744.79/x
  3. Step 3: Cross multiply
    66,419.79x = 99,611.45 × 39,744.79
  4. Step 4: Simplify right side
    66,419.79x = 3,959,035,863.14
  5. Step 5: Solve for x
    x = 3,959,035,863.14/66,419.79
  6. Step 6: Final answer
    x = 59,606.27

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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.