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Finding the Fourth Proportional to 121,578.78, 167,806.71 and 71,293.98

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Solution

The fourth proportional to 121,578.78, 167,806.71 and 71,293.98 is: 98,402.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,578.78 : 167,806.71 = 71,293.98 : x
  2. Step 2: Convert to fraction form
    121,578.78/167,806.71 = 71,293.98/x
  3. Step 3: Cross multiply
    121,578.78x = 167,806.71 × 71,293.98
  4. Step 4: Simplify right side
    121,578.78x = 11,963,608,226.61
  5. Step 5: Solve for x
    x = 11,963,608,226.61/121,578.78
  6. Step 6: Final answer
    x = 98,402.11

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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.