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Finding the Fourth Proportional to 519.03, 780.39 and 478.89

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Solution

The fourth proportional to 519.03, 780.39 and 478.89 is: 720.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.03 : 780.39 = 478.89 : x
  2. Step 2: Convert to fraction form
    519.03/780.39 = 478.89/x
  3. Step 3: Cross multiply
    519.03x = 780.39 × 478.89
  4. Step 4: Simplify right side
    519.03x = 373,720.97
  5. Step 5: Solve for x
    x = 373,720.97/519.03
  6. Step 6: Final answer
    x = 720.04

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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.