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Finding the Fourth Proportional to 318,529.65, 477,794.48 and 81,872.56

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Solution

The fourth proportional to 318,529.65, 477,794.48 and 81,872.56 is: 122,808.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,529.65 : 477,794.48 = 81,872.56 : x
  2. Step 2: Convert to fraction form
    318,529.65/477,794.48 = 81,872.56/x
  3. Step 3: Cross multiply
    318,529.65x = 477,794.48 × 81,872.56
  4. Step 4: Simplify right side
    318,529.65x = 39,118,257,231.47
  5. Step 5: Solve for x
    x = 39,118,257,231.47/318,529.65
  6. Step 6: Final answer
    x = 122,808.84

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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.