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Finding the Fourth Proportional to 189,630.72, 284,592.96 and 71,409.60

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Solution

The fourth proportional to 189,630.72, 284,592.96 and 71,409.60 is: 107,169.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,630.72 : 284,592.96 = 71,409.60 : x
  2. Step 2: Convert to fraction form
    189,630.72/284,592.96 = 71,409.60/x
  3. Step 3: Cross multiply
    189,630.72x = 284,592.96 × 71,409.60
  4. Step 4: Simplify right side
    189,630.72x = 20,322,669,436.42
  5. Step 5: Solve for x
    x = 20,322,669,436.42/189,630.72
  6. Step 6: Final answer
    x = 107,169.71

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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.