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Finding the Fourth Proportional to 121,890.94, 168,209.87 and 68,172.47

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Solution

The fourth proportional to 121,890.94, 168,209.87 and 68,172.47 is: 94,078.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,890.94 : 168,209.87 = 68,172.47 : x
  2. Step 2: Convert to fraction form
    121,890.94/168,209.87 = 68,172.47/x
  3. Step 3: Cross multiply
    121,890.94x = 168,209.87 × 68,172.47
  4. Step 4: Simplify right side
    121,890.94x = 11,467,282,316.28
  5. Step 5: Solve for x
    x = 11,467,282,316.28/121,890.94
  6. Step 6: Final answer
    x = 94,078.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.