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Finding the Fourth Proportional to 121,913.69, 168,247.43 and 68,195.51

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Solution

The fourth proportional to 121,913.69, 168,247.43 and 68,195.51 is: 94,113.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,913.69 : 168,247.43 = 68,195.51 : x
  2. Step 2: Convert to fraction form
    121,913.69/168,247.43 = 68,195.51/x
  3. Step 3: Cross multiply
    121,913.69x = 168,247.43 × 68,195.51
  4. Step 4: Simplify right side
    121,913.69x = 11,473,718,112.82
  5. Step 5: Solve for x
    x = 11,473,718,112.82/121,913.69
  6. Step 6: Final answer
    x = 94,113.45

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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.