Home / 81,185.60-121,778.40-72,729.20

Finding the Fourth Proportional to 81,185.60, 121,778.40 and 72,729.20

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Solution

The fourth proportional to 81,185.60, 121,778.40 and 72,729.20 is: 109,093.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,185.60 : 121,778.40 = 72,729.20 : x
  2. Step 2: Convert to fraction form
    81,185.60/121,778.40 = 72,729.20/x
  3. Step 3: Cross multiply
    81,185.60x = 121,778.40 × 72,729.20
  4. Step 4: Simplify right side
    81,185.60x = 8,856,845,609.28
  5. Step 5: Solve for x
    x = 8,856,845,609.28/81,185.60
  6. Step 6: Final answer
    x = 109,093.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.