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Finding the Fourth Proportional to 779.48, 1,169.62 and 519.66

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Solution

The fourth proportional to 779.48, 1,169.62 and 519.66 is: 779.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.48 : 1,169.62 = 519.66 : x
  2. Step 2: Convert to fraction form
    779.48/1,169.62 = 519.66/x
  3. Step 3: Cross multiply
    779.48x = 1,169.62 × 519.66
  4. Step 4: Simplify right side
    779.48x = 607,804.73
  5. Step 5: Solve for x
    x = 607,804.73/779.48
  6. Step 6: Final answer
    x = 779.76

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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.