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Finding the Fourth Proportional to 519.60, 779.31 and 172.92

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Solution

The fourth proportional to 519.60, 779.31 and 172.92 is: 259.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.60 : 779.31 = 172.92 : x
  2. Step 2: Convert to fraction form
    519.60/779.31 = 172.92/x
  3. Step 3: Cross multiply
    519.60x = 779.31 × 172.92
  4. Step 4: Simplify right side
    519.60x = 134,754.39
  5. Step 5: Solve for x
    x = 134,754.39/519.60
  6. Step 6: Final answer
    x = 259.35

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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.