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Finding the Fourth Proportional to 120,643.19, 166,487.80 and 66,928.21

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Solution

The fourth proportional to 120,643.19, 166,487.80 and 66,928.21 is: 92,361.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,643.19 : 166,487.80 = 66,928.21 : x
  2. Step 2: Convert to fraction form
    120,643.19/166,487.80 = 66,928.21/x
  3. Step 3: Cross multiply
    120,643.19x = 166,487.80 × 66,928.21
  4. Step 4: Simplify right side
    120,643.19x = 11,142,729,794.55
  5. Step 5: Solve for x
    x = 11,142,729,794.55/120,643.19
  6. Step 6: Final answer
    x = 92,361.04

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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.