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Finding the Fourth Proportional to 143,120.88, 214,254.72 and 86,791.32

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Solution

The fourth proportional to 143,120.88, 214,254.72 and 86,791.32 is: 129,928.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,120.88 : 214,254.72 = 86,791.32 : x
  2. Step 2: Convert to fraction form
    143,120.88/214,254.72 = 86,791.32/x
  3. Step 3: Cross multiply
    143,120.88x = 214,254.72 × 86,791.32
  4. Step 4: Simplify right side
    143,120.88x = 18,595,449,965.03
  5. Step 5: Solve for x
    x = 18,595,449,965.03/143,120.88
  6. Step 6: Final answer
    x = 129,928.28

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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.