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Finding the Fourth Proportional to 121,168.60, 181,731.30 and 76,715.80

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Solution

The fourth proportional to 121,168.60, 181,731.30 and 76,715.80 is: 115,060.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,168.60 : 181,731.30 = 76,715.80 : x
  2. Step 2: Convert to fraction form
    121,168.60/181,731.30 = 76,715.80/x
  3. Step 3: Cross multiply
    121,168.60x = 181,731.30 × 76,715.80
  4. Step 4: Simplify right side
    121,168.60x = 13,941,662,064.54
  5. Step 5: Solve for x
    x = 13,941,662,064.54/121,168.60
  6. Step 6: Final answer
    x = 115,060.02

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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.