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Finding the Fourth Proportional to 515.77, 773.38 and 387.25

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Solution

The fourth proportional to 515.77, 773.38 and 387.25 is: 580.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.77 : 773.38 = 387.25 : x
  2. Step 2: Convert to fraction form
    515.77/773.38 = 387.25/x
  3. Step 3: Cross multiply
    515.77x = 773.38 × 387.25
  4. Step 4: Simplify right side
    515.77x = 299,491.41
  5. Step 5: Solve for x
    x = 299,491.41/515.77
  6. Step 6: Final answer
    x = 580.67

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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.