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Finding the Fourth Proportional to 120,108.80, 165,742.94 and 66,390.62

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Solution

The fourth proportional to 120,108.80, 165,742.94 and 66,390.62 is: 91,615.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,108.80 : 165,742.94 = 66,390.62 : x
  2. Step 2: Convert to fraction form
    120,108.80/165,742.94 = 66,390.62/x
  3. Step 3: Cross multiply
    120,108.80x = 165,742.94 × 66,390.62
  4. Step 4: Simplify right side
    120,108.80x = 11,003,775,884.48
  5. Step 5: Solve for x
    x = 11,003,775,884.48/120,108.80
  6. Step 6: Final answer
    x = 91,615.07

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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.