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Finding the Fourth Proportional to 121,579.80, 167,782.78 and 67,131.80

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Solution

The fourth proportional to 121,579.80, 167,782.78 and 67,131.80 is: 92,643.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,579.80 : 167,782.78 = 67,131.80 : x
  2. Step 2: Convert to fraction form
    121,579.80/167,782.78 = 67,131.80/x
  3. Step 3: Cross multiply
    121,579.80x = 167,782.78 × 67,131.80
  4. Step 4: Simplify right side
    121,579.80x = 11,263,560,030.40
  5. Step 5: Solve for x
    x = 11,263,560,030.40/121,579.80
  6. Step 6: Final answer
    x = 92,643.35

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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.