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Finding the Fourth Proportional to 120,628.44, 166,486.32 and 72,888.66

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Solution

The fourth proportional to 120,628.44, 166,486.32 and 72,888.66 is: 100,597.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,628.44 : 166,486.32 = 72,888.66 : x
  2. Step 2: Convert to fraction form
    120,628.44/166,486.32 = 72,888.66/x
  3. Step 3: Cross multiply
    120,628.44x = 166,486.32 × 72,888.66
  4. Step 4: Simplify right side
    120,628.44x = 12,134,964,773.13
  5. Step 5: Solve for x
    x = 12,134,964,773.13/120,628.44
  6. Step 6: Final answer
    x = 100,597.88

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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.