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Finding the Fourth Proportional to 100,912.21, 151,365.54 and 43,986.08

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Solution

The fourth proportional to 100,912.21, 151,365.54 and 43,986.08 is: 65,977.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,912.21 : 151,365.54 = 43,986.08 : x
  2. Step 2: Convert to fraction form
    100,912.21/151,365.54 = 43,986.08/x
  3. Step 3: Cross multiply
    100,912.21x = 151,365.54 × 43,986.08
  4. Step 4: Simplify right side
    100,912.21x = 6,657,976,184.06
  5. Step 5: Solve for x
    x = 6,657,976,184.06/100,912.21
  6. Step 6: Final answer
    x = 65,977.91

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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.