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Finding the Fourth Proportional to 121,221.63, 167,391.61 and 75,977.39

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Solution

The fourth proportional to 121,221.63, 167,391.61 and 75,977.39 is: 104,915.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,221.63 : 167,391.61 = 75,977.39 : x
  2. Step 2: Convert to fraction form
    121,221.63/167,391.61 = 75,977.39/x
  3. Step 3: Cross multiply
    121,221.63x = 167,391.61 × 75,977.39
  4. Step 4: Simplify right side
    121,221.63x = 12,717,977,864.23
  5. Step 5: Solve for x
    x = 12,717,977,864.23/121,221.63
  6. Step 6: Final answer
    x = 104,915.09

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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.