Home / 120,128.58-165,770.30-66,410.38

Finding the Fourth Proportional to 120,128.58, 165,770.30 and 66,410.38

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Solution

The fourth proportional to 120,128.58, 165,770.30 and 66,410.38 is: 91,642.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,128.58 : 165,770.30 = 66,410.38 : x
  2. Step 2: Convert to fraction form
    120,128.58/165,770.30 = 66,410.38/x
  3. Step 3: Cross multiply
    120,128.58x = 165,770.30 × 66,410.38
  4. Step 4: Simplify right side
    120,128.58x = 11,008,868,615.71
  5. Step 5: Solve for x
    x = 11,008,868,615.71/120,128.58
  6. Step 6: Final answer
    x = 91,642.38

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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.