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Finding the Fourth Proportional to 121,390.80, 182,086.20 and 102,145.20

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Solution

The fourth proportional to 121,390.80, 182,086.20 and 102,145.20 is: 153,217.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,390.80 : 182,086.20 = 102,145.20 : x
  2. Step 2: Convert to fraction form
    121,390.80/182,086.20 = 102,145.20/x
  3. Step 3: Cross multiply
    121,390.80x = 182,086.20 × 102,145.20
  4. Step 4: Simplify right side
    121,390.80x = 18,599,231,316.24
  5. Step 5: Solve for x
    x = 18,599,231,316.24/121,390.80
  6. Step 6: Final answer
    x = 153,217.80

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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.