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Finding the Fourth Proportional to 128,993.94, 178,028.10 and 72,405.36

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Solution

The fourth proportional to 128,993.94, 178,028.10 and 72,405.36 is: 99,928.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,993.94 : 178,028.10 = 72,405.36 : x
  2. Step 2: Convert to fraction form
    128,993.94/178,028.10 = 72,405.36/x
  3. Step 3: Cross multiply
    128,993.94x = 178,028.10 × 72,405.36
  4. Step 4: Simplify right side
    128,993.94x = 12,890,188,670.62
  5. Step 5: Solve for x
    x = 12,890,188,670.62/128,993.94
  6. Step 6: Final answer
    x = 99,928.64

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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.