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Finding the Fourth Proportional to 121,078.50, 167,089.86 and 66,636.93

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Solution

The fourth proportional to 121,078.50, 167,089.86 and 66,636.93 is: 91,959.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,078.50 : 167,089.86 = 66,636.93 : x
  2. Step 2: Convert to fraction form
    121,078.50/167,089.86 = 66,636.93/x
  3. Step 3: Cross multiply
    121,078.50x = 167,089.86 × 66,636.93
  4. Step 4: Simplify right side
    121,078.50x = 11,134,355,304.53
  5. Step 5: Solve for x
    x = 11,134,355,304.53/121,078.50
  6. Step 6: Final answer
    x = 91,959.81

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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.