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Finding the Fourth Proportional to 121,208.64, 167,256 and 67,491.60

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Solution

The fourth proportional to 121,208.64, 167,256 and 67,491.60 is: 93,131.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,208.64 : 167,256 = 67,491.60 : x
  2. Step 2: Convert to fraction form
    121,208.64/167,256 = 67,491.60/x
  3. Step 3: Cross multiply
    121,208.64x = 167,256 × 67,491.60
  4. Step 4: Simplify right side
    121,208.64x = 11,288,375,049.60
  5. Step 5: Solve for x
    x = 11,288,375,049.60/121,208.64
  6. Step 6: Final answer
    x = 93,131.77

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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.