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Finding the Fourth Proportional to 121,290.20, 181,935.30 and 85,860.80

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Solution

The fourth proportional to 121,290.20, 181,935.30 and 85,860.80 is: 128,791.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,290.20 : 181,935.30 = 85,860.80 : x
  2. Step 2: Convert to fraction form
    121,290.20/181,935.30 = 85,860.80/x
  3. Step 3: Cross multiply
    121,290.20x = 181,935.30 × 85,860.80
  4. Step 4: Simplify right side
    121,290.20x = 15,621,110,406.24
  5. Step 5: Solve for x
    x = 15,621,110,406.24/121,290.20
  6. Step 6: Final answer
    x = 128,791.20

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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.