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Finding the Fourth Proportional to 121,020, 167,007.60 and 68,028

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Solution

The fourth proportional to 121,020, 167,007.60 and 68,028 is: 93,878.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,020 : 167,007.60 = 68,028 : x
  2. Step 2: Convert to fraction form
    121,020/167,007.60 = 68,028/x
  3. Step 3: Cross multiply
    121,020x = 167,007.60 × 68,028
  4. Step 4: Simplify right side
    121,020x = 11,361,193,012.80
  5. Step 5: Solve for x
    x = 11,361,193,012.80/121,020
  6. Step 6: Final answer
    x = 93,878.64

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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.