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Finding the Fourth Proportional to 121,140.60, 181,689.30 and 76,687.80

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Solution

The fourth proportional to 121,140.60, 181,689.30 and 76,687.80 is: 115,018.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,140.60 : 181,689.30 = 76,687.80 : x
  2. Step 2: Convert to fraction form
    121,140.60/181,689.30 = 76,687.80/x
  3. Step 3: Cross multiply
    121,140.60x = 181,689.30 × 76,687.80
  4. Step 4: Simplify right side
    121,140.60x = 13,933,352,700.54
  5. Step 5: Solve for x
    x = 13,933,352,700.54/121,140.60
  6. Step 6: Final answer
    x = 115,018.03

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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.