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Finding the Fourth Proportional to 515.27, 772.63 and 386.75

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Solution

The fourth proportional to 515.27, 772.63 and 386.75 is: 579.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.27 : 772.63 = 386.75 : x
  2. Step 2: Convert to fraction form
    515.27/772.63 = 386.75/x
  3. Step 3: Cross multiply
    515.27x = 772.63 × 386.75
  4. Step 4: Simplify right side
    515.27x = 298,814.65
  5. Step 5: Solve for x
    x = 298,814.65/515.27
  6. Step 6: Final answer
    x = 579.92

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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.