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Finding the Fourth Proportional to 121,790.61, 168,072.03 and 68,077.89

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Solution

The fourth proportional to 121,790.61, 168,072.03 and 68,077.89 is: 93,948.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,790.61 : 168,072.03 = 68,077.89 : x
  2. Step 2: Convert to fraction form
    121,790.61/168,072.03 = 68,077.89/x
  3. Step 3: Cross multiply
    121,790.61x = 168,072.03 × 68,077.89
  4. Step 4: Simplify right side
    121,790.61x = 11,441,989,170.42
  5. Step 5: Solve for x
    x = 11,441,989,170.42/121,790.61
  6. Step 6: Final answer
    x = 93,948.04

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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.