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Finding the Fourth Proportional to 66,387.36, 91,619.08 and 40,556.96

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Solution

The fourth proportional to 66,387.36, 91,619.08 and 40,556.96 is: 55,971.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,387.36 : 91,619.08 = 40,556.96 : x
  2. Step 2: Convert to fraction form
    66,387.36/91,619.08 = 40,556.96/x
  3. Step 3: Cross multiply
    66,387.36x = 91,619.08 × 40,556.96
  4. Step 4: Simplify right side
    66,387.36x = 3,715,791,362.80
  5. Step 5: Solve for x
    x = 3,715,791,362.80/66,387.36
  6. Step 6: Final answer
    x = 55,971.37

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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.