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Finding the Fourth Proportional to 318,925.20, 478,375.80 and 79,039.80

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Solution

The fourth proportional to 318,925.20, 478,375.80 and 79,039.80 is: 118,556.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,925.20 : 478,375.80 = 79,039.80 : x
  2. Step 2: Convert to fraction form
    318,925.20/478,375.80 = 79,039.80/x
  3. Step 3: Cross multiply
    318,925.20x = 478,375.80 × 79,039.80
  4. Step 4: Simplify right side
    318,925.20x = 37,810,727,556.84
  5. Step 5: Solve for x
    x = 37,810,727,556.84/318,925.20
  6. Step 6: Final answer
    x = 118,556.73

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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.