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Finding the Fourth Proportional to 515.14, 772.53 and 190.78

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Solution

The fourth proportional to 515.14, 772.53 and 190.78 is: 286.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.14 : 772.53 = 190.78 : x
  2. Step 2: Convert to fraction form
    515.14/772.53 = 190.78/x
  3. Step 3: Cross multiply
    515.14x = 772.53 × 190.78
  4. Step 4: Simplify right side
    515.14x = 147,383.27
  5. Step 5: Solve for x
    x = 147,383.27/515.14
  6. Step 6: Final answer
    x = 286.10

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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.