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Finding the Fourth Proportional to 121,891.20, 182,480.40 and 86,899.20

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Solution

The fourth proportional to 121,891.20, 182,480.40 and 86,899.20 is: 130,094.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,891.20 : 182,480.40 = 86,899.20 : x
  2. Step 2: Convert to fraction form
    121,891.20/182,480.40 = 86,899.20/x
  3. Step 3: Cross multiply
    121,891.20x = 182,480.40 × 86,899.20
  4. Step 4: Simplify right side
    121,891.20x = 15,857,400,775.68
  5. Step 5: Solve for x
    x = 15,857,400,775.68/121,891.20
  6. Step 6: Final answer
    x = 130,094.71

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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.