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Finding the Fourth Proportional to 515.74, 773.61 and 438.52

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Solution

The fourth proportional to 515.74, 773.61 and 438.52 is: 657.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.74 : 773.61 = 438.52 : x
  2. Step 2: Convert to fraction form
    515.74/773.61 = 438.52/x
  3. Step 3: Cross multiply
    515.74x = 773.61 × 438.52
  4. Step 4: Simplify right side
    515.74x = 339,241.26
  5. Step 5: Solve for x
    x = 339,241.26/515.74
  6. Step 6: Final answer
    x = 657.78

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Similar ratio
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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.