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Finding the Fourth Proportional to 720.14, 1,078.94 and 513.65

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Solution

The fourth proportional to 720.14, 1,078.94 and 513.65 is: 769.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.14 : 1,078.94 = 513.65 : x
  2. Step 2: Convert to fraction form
    720.14/1,078.94 = 513.65/x
  3. Step 3: Cross multiply
    720.14x = 1,078.94 × 513.65
  4. Step 4: Simplify right side
    720.14x = 554,189.57
  5. Step 5: Solve for x
    x = 554,189.57/720.14
  6. Step 6: Final answer
    x = 769.56

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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.