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Finding the Fourth Proportional to 321,638.48, 443,861.35 and 178,399.55

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Solution

The fourth proportional to 321,638.48, 443,861.35 and 178,399.55 is: 246,191.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,638.48 : 443,861.35 = 178,399.55 : x
  2. Step 2: Convert to fraction form
    321,638.48/443,861.35 = 178,399.55/x
  3. Step 3: Cross multiply
    321,638.48x = 443,861.35 × 178,399.55
  4. Step 4: Simplify right side
    321,638.48x = 79,184,665,102.39
  5. Step 5: Solve for x
    x = 79,184,665,102.39/321,638.48
  6. Step 6: Final answer
    x = 246,191.52

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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.