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Finding the Fourth Proportional to 66,943.80, 100,415.70 and 43,324.20

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Solution

The fourth proportional to 66,943.80, 100,415.70 and 43,324.20 is: 64,986.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,943.80 : 100,415.70 = 43,324.20 : x
  2. Step 2: Convert to fraction form
    66,943.80/100,415.70 = 43,324.20/x
  3. Step 3: Cross multiply
    66,943.80x = 100,415.70 × 43,324.20
  4. Step 4: Simplify right side
    66,943.80x = 4,350,429,869.94
  5. Step 5: Solve for x
    x = 4,350,429,869.94/66,943.80
  6. Step 6: Final answer
    x = 64,986.30

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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.