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Finding the Fourth Proportional to 687.56, 949.68 and 513.68

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Solution

The fourth proportional to 687.56, 949.68 and 513.68 is: 709.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.56 : 949.68 = 513.68 : x
  2. Step 2: Convert to fraction form
    687.56/949.68 = 513.68/x
  3. Step 3: Cross multiply
    687.56x = 949.68 × 513.68
  4. Step 4: Simplify right side
    687.56x = 487,831.62
  5. Step 5: Solve for x
    x = 487,831.62/687.56
  6. Step 6: Final answer
    x = 709.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.