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Finding the Fourth Proportional to 120,616.58, 166,470.80 and 66,918.90

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Solution

The fourth proportional to 120,616.58, 166,470.80 and 66,918.90 is: 92,359.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,616.58 : 166,470.80 = 66,918.90 : x
  2. Step 2: Convert to fraction form
    120,616.58/166,470.80 = 66,918.90/x
  3. Step 3: Cross multiply
    120,616.58x = 166,470.80 × 66,918.90
  4. Step 4: Simplify right side
    120,616.58x = 11,140,042,818.12
  5. Step 5: Solve for x
    x = 11,140,042,818.12/120,616.58
  6. Step 6: Final answer
    x = 92,359.13

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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.