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Finding the Fourth Proportional to 519.60, 778.14 and 428.52

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Solution

The fourth proportional to 519.60, 778.14 and 428.52 is: 641.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.60 : 778.14 = 428.52 : x
  2. Step 2: Convert to fraction form
    519.60/778.14 = 428.52/x
  3. Step 3: Cross multiply
    519.60x = 778.14 × 428.52
  4. Step 4: Simplify right side
    519.60x = 333,448.55
  5. Step 5: Solve for x
    x = 333,448.55/519.60
  6. Step 6: Final answer
    x = 641.74

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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.