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Finding the Fourth Proportional to 120,028.72, 165,649.34 and 66,318.44

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Solution

The fourth proportional to 120,028.72, 165,649.34 and 66,318.44 is: 91,524.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,028.72 : 165,649.34 = 66,318.44 : x
  2. Step 2: Convert to fraction form
    120,028.72/165,649.34 = 66,318.44/x
  3. Step 3: Cross multiply
    120,028.72x = 165,649.34 × 66,318.44
  4. Step 4: Simplify right side
    120,028.72x = 10,985,605,815.83
  5. Step 5: Solve for x
    x = 10,985,605,815.83/120,028.72
  6. Step 6: Final answer
    x = 91,524.81

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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.