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Finding the Fourth Proportional to 121,129.60, 181,726.80 and 86,137.60

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Solution

The fourth proportional to 121,129.60, 181,726.80 and 86,137.60 is: 129,229.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,129.60 : 181,726.80 = 86,137.60 : x
  2. Step 2: Convert to fraction form
    121,129.60/181,726.80 = 86,137.60/x
  3. Step 3: Cross multiply
    121,129.60x = 181,726.80 × 86,137.60
  4. Step 4: Simplify right side
    121,129.60x = 15,653,510,407.68
  5. Step 5: Solve for x
    x = 15,653,510,407.68/121,129.60
  6. Step 6: Final answer
    x = 129,229.44

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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.