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Finding the Fourth Proportional to 321,679.72, 443,911.08 and 178,436.69

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Solution

The fourth proportional to 321,679.72, 443,911.08 and 178,436.69 is: 246,238.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,679.72 : 443,911.08 = 178,436.69 : x
  2. Step 2: Convert to fraction form
    321,679.72/443,911.08 = 178,436.69/x
  3. Step 3: Cross multiply
    321,679.72x = 443,911.08 × 178,436.69
  4. Step 4: Simplify right side
    321,679.72x = 79,210,023,883.77
  5. Step 5: Solve for x
    x = 79,210,023,883.77/321,679.72
  6. Step 6: Final answer
    x = 246,238.79

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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.