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Finding the Fourth Proportional to 515.91, 773.70 and 207.81

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Solution

The fourth proportional to 515.91, 773.70 and 207.81 is: 311.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.91 : 773.70 = 207.81 : x
  2. Step 2: Convert to fraction form
    515.91/773.70 = 207.81/x
  3. Step 3: Cross multiply
    515.91x = 773.70 × 207.81
  4. Step 4: Simplify right side
    515.91x = 160,782.60
  5. Step 5: Solve for x
    x = 160,782.60/515.91
  6. Step 6: Final answer
    x = 311.65

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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.