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Finding the Fourth Proportional to 120,630.78, 166,490.40 and 66,933.09

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Solution

The fourth proportional to 120,630.78, 166,490.40 and 66,933.09 is: 92,378.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,630.78 : 166,490.40 = 66,933.09 : x
  2. Step 2: Convert to fraction form
    120,630.78/166,490.40 = 66,933.09/x
  3. Step 3: Cross multiply
    120,630.78x = 166,490.40 × 66,933.09
  4. Step 4: Simplify right side
    120,630.78x = 11,143,717,094.67
  5. Step 5: Solve for x
    x = 11,143,717,094.67/120,630.78
  6. Step 6: Final answer
    x = 92,378.72

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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.