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Finding the Fourth Proportional to 66,135.78, 99,239.21 and 43,959.60

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Solution

The fourth proportional to 66,135.78, 99,239.21 and 43,959.60 is: 65,963.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,135.78 : 99,239.21 = 43,959.60 : x
  2. Step 2: Convert to fraction form
    66,135.78/99,239.21 = 43,959.60/x
  3. Step 3: Cross multiply
    66,135.78x = 99,239.21 × 43,959.60
  4. Step 4: Simplify right side
    66,135.78x = 4,362,515,756.12
  5. Step 5: Solve for x
    x = 4,362,515,756.12/66,135.78
  6. Step 6: Final answer
    x = 65,963.02

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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.