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Finding the Fourth Proportional to 121,309.98, 181,997.94 and 68,756.40

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Solution

The fourth proportional to 121,309.98, 181,997.94 and 68,756.40 is: 103,153.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,309.98 : 181,997.94 = 68,756.40 : x
  2. Step 2: Convert to fraction form
    121,309.98/181,997.94 = 68,756.40/x
  3. Step 3: Cross multiply
    121,309.98x = 181,997.94 × 68,756.40
  4. Step 4: Simplify right side
    121,309.98x = 12,513,523,161.82
  5. Step 5: Solve for x
    x = 12,513,523,161.82/121,309.98
  6. Step 6: Final answer
    x = 103,153.29

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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.