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Finding the Fourth Proportional to 318,721.80, 478,104.30 and 108,375.60

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Solution

The fourth proportional to 318,721.80, 478,104.30 and 108,375.60 is: 162,570.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,721.80 : 478,104.30 = 108,375.60 : x
  2. Step 2: Convert to fraction form
    318,721.80/478,104.30 = 108,375.60/x
  3. Step 3: Cross multiply
    318,721.80x = 478,104.30 × 108,375.60
  4. Step 4: Simplify right side
    318,721.80x = 51,814,840,375.08
  5. Step 5: Solve for x
    x = 51,814,840,375.08/318,721.80
  6. Step 6: Final answer
    x = 162,570.74

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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.