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Finding the Fourth Proportional to 120,145.67, 165,786.91 and 66,427.48

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Solution

The fourth proportional to 120,145.67, 165,786.91 and 66,427.48 is: 91,662.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,145.67 : 165,786.91 = 66,427.48 : x
  2. Step 2: Convert to fraction form
    120,145.67/165,786.91 = 66,427.48/x
  3. Step 3: Cross multiply
    120,145.67x = 165,786.91 × 66,427.48
  4. Step 4: Simplify right side
    120,145.67x = 11,012,806,648.29
  5. Step 5: Solve for x
    x = 11,012,806,648.29/120,145.67
  6. Step 6: Final answer
    x = 91,662.12

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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.