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Finding the Fourth Proportional to 121,422.80, 182,123.96 and 68,666.32

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Solution

The fourth proportional to 121,422.80, 182,123.96 and 68,666.32 is: 102,993.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,422.80 : 182,123.96 = 68,666.32 : x
  2. Step 2: Convert to fraction form
    121,422.80/182,123.96 = 68,666.32/x
  3. Step 3: Cross multiply
    121,422.80x = 182,123.96 × 68,666.32
  4. Step 4: Simplify right side
    121,422.80x = 12,505,782,117.03
  5. Step 5: Solve for x
    x = 12,505,782,117.03/121,422.80
  6. Step 6: Final answer
    x = 102,993.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.