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Finding the Fourth Proportional to 519.68, 779.76 and 231.20

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Solution

The fourth proportional to 519.68, 779.76 and 231.20 is: 346.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.68 : 779.76 = 231.20 : x
  2. Step 2: Convert to fraction form
    519.68/779.76 = 231.20/x
  3. Step 3: Cross multiply
    519.68x = 779.76 × 231.20
  4. Step 4: Simplify right side
    519.68x = 180,280.51
  5. Step 5: Solve for x
    x = 180,280.51/519.68
  6. Step 6: Final answer
    x = 346.91

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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.