Home / 128,716.44-177,611.58-72,128.76

Finding the Fourth Proportional to 128,716.44, 177,611.58 and 72,128.76

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Solution

The fourth proportional to 128,716.44, 177,611.58 and 72,128.76 is: 99,528.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,716.44 : 177,611.58 = 72,128.76 : x
  2. Step 2: Convert to fraction form
    128,716.44/177,611.58 = 72,128.76/x
  3. Step 3: Cross multiply
    128,716.44x = 177,611.58 × 72,128.76
  4. Step 4: Simplify right side
    128,716.44x = 12,810,903,027.04
  5. Step 5: Solve for x
    x = 12,810,903,027.04/128,716.44
  6. Step 6: Final answer
    x = 99,528.10

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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.