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Finding the Fourth Proportional to 679.81, 936.96 and 520.24

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Solution

The fourth proportional to 679.81, 936.96 and 520.24 is: 717.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.81 : 936.96 = 520.24 : x
  2. Step 2: Convert to fraction form
    679.81/936.96 = 520.24/x
  3. Step 3: Cross multiply
    679.81x = 936.96 × 520.24
  4. Step 4: Simplify right side
    679.81x = 487,444.07
  5. Step 5: Solve for x
    x = 487,444.07/679.81
  6. Step 6: Final answer
    x = 717.03

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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.