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Finding the Fourth Proportional to 515.90, 774.45 and 512.30

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Solution

The fourth proportional to 515.90, 774.45 and 512.30 is: 769.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.90 : 774.45 = 512.30 : x
  2. Step 2: Convert to fraction form
    515.90/774.45 = 512.30/x
  3. Step 3: Cross multiply
    515.90x = 774.45 × 512.30
  4. Step 4: Simplify right side
    515.90x = 396,750.74
  5. Step 5: Solve for x
    x = 396,750.74/515.90
  6. Step 6: Final answer
    x = 769.05

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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.