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Finding the Fourth Proportional to 120,515.56, 166,315.80 and 72,759.64

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Solution

The fourth proportional to 120,515.56, 166,315.80 and 72,759.64 is: 100,410.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,515.56 : 166,315.80 = 72,759.64 : x
  2. Step 2: Convert to fraction form
    120,515.56/166,315.80 = 72,759.64/x
  3. Step 3: Cross multiply
    120,515.56x = 166,315.80 × 72,759.64
  4. Step 4: Simplify right side
    120,515.56x = 12,101,077,734.31
  5. Step 5: Solve for x
    x = 12,101,077,734.31/120,515.56
  6. Step 6: Final answer
    x = 100,410.92

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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.