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Finding the Fourth Proportional to 121,509.72, 167,696.38 and 67,813.40

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Solution

The fourth proportional to 121,509.72, 167,696.38 and 67,813.40 is: 93,589.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,509.72 : 167,696.38 = 67,813.40 : x
  2. Step 2: Convert to fraction form
    121,509.72/167,696.38 = 67,813.40/x
  3. Step 3: Cross multiply
    121,509.72x = 167,696.38 × 67,813.40
  4. Step 4: Simplify right side
    121,509.72x = 11,372,061,695.49
  5. Step 5: Solve for x
    x = 11,372,061,695.49/121,509.72
  6. Step 6: Final answer
    x = 93,589.73

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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.