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Finding the Fourth Proportional to 121,115, 167,141.28 and 67,409.60

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Solution

The fourth proportional to 121,115, 167,141.28 and 67,409.60 is: 93,026.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,115 : 167,141.28 = 67,409.60 : x
  2. Step 2: Convert to fraction form
    121,115/167,141.28 = 67,409.60/x
  3. Step 3: Cross multiply
    121,115x = 167,141.28 × 67,409.60
  4. Step 4: Simplify right side
    121,115x = 11,266,926,828.29
  5. Step 5: Solve for x
    x = 11,266,926,828.29/121,115
  6. Step 6: Final answer
    x = 93,026.68

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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.