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Finding the Fourth Proportional to 121,309.90, 182,021.21 and 46,405.28

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Solution

The fourth proportional to 121,309.90, 182,021.21 and 46,405.28 is: 69,629.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,309.90 : 182,021.21 = 46,405.28 : x
  2. Step 2: Convert to fraction form
    121,309.90/182,021.21 = 46,405.28/x
  3. Step 3: Cross multiply
    121,309.90x = 182,021.21 × 46,405.28
  4. Step 4: Simplify right side
    121,309.90x = 8,446,744,983.96
  5. Step 5: Solve for x
    x = 8,446,744,983.96/121,309.90
  6. Step 6: Final answer
    x = 69,629.48

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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.