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Finding the Fourth Proportional to 121,865.25, 168,172.63 and 68,149.77

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Solution

The fourth proportional to 121,865.25, 168,172.63 and 68,149.77 is: 94,045.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,865.25 : 168,172.63 = 68,149.77 : x
  2. Step 2: Convert to fraction form
    121,865.25/168,172.63 = 68,149.77/x
  3. Step 3: Cross multiply
    121,865.25x = 168,172.63 × 68,149.77
  4. Step 4: Simplify right side
    121,865.25x = 11,460,924,873.18
  5. Step 5: Solve for x
    x = 11,460,924,873.18/121,865.25
  6. Step 6: Final answer
    x = 94,045.88

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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.