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Finding the Fourth Proportional to 120,143.58, 165,795.19 and 66,427.21

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Solution

The fourth proportional to 120,143.58, 165,795.19 and 66,427.21 is: 91,667.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,143.58 : 165,795.19 = 66,427.21 : x
  2. Step 2: Convert to fraction form
    120,143.58/165,795.19 = 66,427.21/x
  3. Step 3: Cross multiply
    120,143.58x = 165,795.19 × 66,427.21
  4. Step 4: Simplify right side
    120,143.58x = 11,013,311,903.12
  5. Step 5: Solve for x
    x = 11,013,311,903.12/120,143.58
  6. Step 6: Final answer
    x = 91,667.92

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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.