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Finding the Fourth Proportional to 121,611.78, 167,808.51 and 79,227.72

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Solution

The fourth proportional to 121,611.78, 167,808.51 and 79,227.72 is: 109,324.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,611.78 : 167,808.51 = 79,227.72 : x
  2. Step 2: Convert to fraction form
    121,611.78/167,808.51 = 79,227.72/x
  3. Step 3: Cross multiply
    121,611.78x = 167,808.51 × 79,227.72
  4. Step 4: Simplify right side
    121,611.78x = 13,295,085,643.90
  5. Step 5: Solve for x
    x = 13,295,085,643.90/121,611.78
  6. Step 6: Final answer
    x = 109,324.00

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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.