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Finding the Fourth Proportional to 515.40, 767.09 and 513.80

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Solution

The fourth proportional to 515.40, 767.09 and 513.80 is: 764.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.40 : 767.09 = 513.80 : x
  2. Step 2: Convert to fraction form
    515.40/767.09 = 513.80/x
  3. Step 3: Cross multiply
    515.40x = 767.09 × 513.80
  4. Step 4: Simplify right side
    515.40x = 394,130.84
  5. Step 5: Solve for x
    x = 394,130.84/515.40
  6. Step 6: Final answer
    x = 764.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.