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Finding the Fourth Proportional to 515.65, 773.90 and 511.60

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Solution

The fourth proportional to 515.65, 773.90 and 511.60 is: 767.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.65 : 773.90 = 511.60 : x
  2. Step 2: Convert to fraction form
    515.65/773.90 = 511.60/x
  3. Step 3: Cross multiply
    515.65x = 773.90 × 511.60
  4. Step 4: Simplify right side
    515.65x = 395,920.81
  5. Step 5: Solve for x
    x = 395,920.81/515.65
  6. Step 6: Final answer
    x = 767.82

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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.