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Finding the Fourth Proportional to 120,143.75, 165,791.90 and 66,425.63

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Solution

The fourth proportional to 120,143.75, 165,791.90 and 66,425.63 is: 91,663.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,143.75 : 165,791.90 = 66,425.63 : x
  2. Step 2: Convert to fraction form
    120,143.75/165,791.90 = 66,425.63/x
  3. Step 3: Cross multiply
    120,143.75x = 165,791.90 × 66,425.63
  4. Step 4: Simplify right side
    120,143.75x = 11,012,831,074.27
  5. Step 5: Solve for x
    x = 11,012,831,074.27/120,143.75
  6. Step 6: Final answer
    x = 91,663.79

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1.5x scale

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.