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Finding the Fourth Proportional to 519.78, 780.42 and 347.52

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Solution

The fourth proportional to 519.78, 780.42 and 347.52 is: 521.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.78 : 780.42 = 347.52 : x
  2. Step 2: Convert to fraction form
    519.78/780.42 = 347.52/x
  3. Step 3: Cross multiply
    519.78x = 780.42 × 347.52
  4. Step 4: Simplify right side
    519.78x = 271,211.56
  5. Step 5: Solve for x
    x = 271,211.56/519.78
  6. Step 6: Final answer
    x = 521.78

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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.