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Finding the Fourth Proportional to 120,978.18, 166,940.39 and 67,259.90

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Solution

The fourth proportional to 120,978.18, 166,940.39 and 67,259.90 is: 92,813.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,978.18 : 166,940.39 = 67,259.90 : x
  2. Step 2: Convert to fraction form
    120,978.18/166,940.39 = 67,259.90/x
  3. Step 3: Cross multiply
    120,978.18x = 166,940.39 × 67,259.90
  4. Step 4: Simplify right side
    120,978.18x = 11,228,393,937.36
  5. Step 5: Solve for x
    x = 11,228,393,937.36/120,978.18
  6. Step 6: Final answer
    x = 92,813.38

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1.5x scale

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.