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Finding the Fourth Proportional to 121,940.68, 168,281.76 and 68,224.48

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Solution

The fourth proportional to 121,940.68, 168,281.76 and 68,224.48 is: 94,151.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,940.68 : 168,281.76 = 68,224.48 : x
  2. Step 2: Convert to fraction form
    121,940.68/168,281.76 = 68,224.48/x
  3. Step 3: Cross multiply
    121,940.68x = 168,281.76 × 68,224.48
  4. Step 4: Simplify right side
    121,940.68x = 11,480,935,569.48
  5. Step 5: Solve for x
    x = 11,480,935,569.48/121,940.68
  6. Step 6: Final answer
    x = 94,151.81

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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.