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Finding the Fourth Proportional to 121,916.42, 168,245.26 and 68,201.40

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Solution

The fourth proportional to 121,916.42, 168,245.26 and 68,201.40 is: 94,118.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,916.42 : 168,245.26 = 68,201.40 : x
  2. Step 2: Convert to fraction form
    121,916.42/168,245.26 = 68,201.40/x
  3. Step 3: Cross multiply
    121,916.42x = 168,245.26 × 68,201.40
  4. Step 4: Simplify right side
    121,916.42x = 11,474,562,104.86
  5. Step 5: Solve for x
    x = 11,474,562,104.86/121,916.42
  6. Step 6: Final answer
    x = 94,118.27

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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.