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Finding the Fourth Proportional to 121,015.20, 181,609.20 and 68,368.80

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Solution

The fourth proportional to 121,015.20, 181,609.20 and 68,368.80 is: 102,602.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,015.20 : 181,609.20 = 68,368.80 : x
  2. Step 2: Convert to fraction form
    121,015.20/181,609.20 = 68,368.80/x
  3. Step 3: Cross multiply
    121,015.20x = 181,609.20 × 68,368.80
  4. Step 4: Simplify right side
    121,015.20x = 12,416,403,072.96
  5. Step 5: Solve for x
    x = 12,416,403,072.96/121,015.20
  6. Step 6: Final answer
    x = 102,602.01

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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.