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Finding the Fourth Proportional to 128,611.92, 177,474.60 and 72,015.60

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Solution

The fourth proportional to 128,611.92, 177,474.60 and 72,015.60 is: 99,376.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.92 : 177,474.60 = 72,015.60 : x
  2. Step 2: Convert to fraction form
    128,611.92/177,474.60 = 72,015.60/x
  3. Step 3: Cross multiply
    128,611.92x = 177,474.60 × 72,015.60
  4. Step 4: Simplify right side
    128,611.92x = 12,780,939,803.76
  5. Step 5: Solve for x
    x = 12,780,939,803.76/128,611.92
  6. Step 6: Final answer
    x = 99,376.01

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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.