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Finding the Fourth Proportional to 121,766.40, 168,036.32 and 67,318.34

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Solution

The fourth proportional to 121,766.40, 168,036.32 and 67,318.34 is: 92,898.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,766.40 : 168,036.32 = 67,318.34 : x
  2. Step 2: Convert to fraction form
    121,766.40/168,036.32 = 67,318.34/x
  3. Step 3: Cross multiply
    121,766.40x = 168,036.32 × 67,318.34
  4. Step 4: Simplify right side
    121,766.40x = 11,311,925,450.22
  5. Step 5: Solve for x
    x = 11,311,925,450.22/121,766.40
  6. Step 6: Final answer
    x = 92,898.58

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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.