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Finding the Fourth Proportional to 120,955.69, 181,464.21 and 85,486.80

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Solution

The fourth proportional to 120,955.69, 181,464.21 and 85,486.80 is: 128,251.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,955.69 : 181,464.21 = 85,486.80 : x
  2. Step 2: Convert to fraction form
    120,955.69/181,464.21 = 85,486.80/x
  3. Step 3: Cross multiply
    120,955.69x = 181,464.21 × 85,486.80
  4. Step 4: Simplify right side
    120,955.69x = 15,512,794,627.43
  5. Step 5: Solve for x
    x = 15,512,794,627.43/120,955.69
  6. Step 6: Final answer
    x = 128,251.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.