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Finding the Fourth Proportional to 720.52, 1,078.62 and 511.56

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Solution

The fourth proportional to 720.52, 1,078.62 and 511.56 is: 765.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.52 : 1,078.62 = 511.56 : x
  2. Step 2: Convert to fraction form
    720.52/1,078.62 = 511.56/x
  3. Step 3: Cross multiply
    720.52x = 1,078.62 × 511.56
  4. Step 4: Simplify right side
    720.52x = 551,778.85
  5. Step 5: Solve for x
    x = 551,778.85/720.52
  6. Step 6: Final answer
    x = 765.81

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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.