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Finding the Fourth Proportional to 318,908.80, 478,363.20 and 185,939.20

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Solution

The fourth proportional to 318,908.80, 478,363.20 and 185,939.20 is: 278,908.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,908.80 : 478,363.20 = 185,939.20 : x
  2. Step 2: Convert to fraction form
    318,908.80/478,363.20 = 185,939.20/x
  3. Step 3: Cross multiply
    318,908.80x = 478,363.20 × 185,939.20
  4. Step 4: Simplify right side
    318,908.80x = 88,946,470,717.44
  5. Step 5: Solve for x
    x = 88,946,470,717.44/318,908.80
  6. Step 6: Final answer
    x = 278,908.80

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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.