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Finding the Fourth Proportional to 121,021.10, 181,568.10 and 86,029.10

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Solution

The fourth proportional to 121,021.10, 181,568.10 and 86,029.10 is: 129,069.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,021.10 : 181,568.10 = 86,029.10 : x
  2. Step 2: Convert to fraction form
    121,021.10/181,568.10 = 86,029.10/x
  3. Step 3: Cross multiply
    121,021.10x = 181,568.10 × 86,029.10
  4. Step 4: Simplify right side
    121,021.10x = 15,620,140,231.71
  5. Step 5: Solve for x
    x = 15,620,140,231.71/121,021.10
  6. Step 6: Final answer
    x = 129,069.56

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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.