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Finding the Fourth Proportional to 516.72, 713.40 and 320.28

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Solution

The fourth proportional to 516.72, 713.40 and 320.28 is: 442.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.72 : 713.40 = 320.28 : x
  2. Step 2: Convert to fraction form
    516.72/713.40 = 320.28/x
  3. Step 3: Cross multiply
    516.72x = 713.40 × 320.28
  4. Step 4: Simplify right side
    516.72x = 228,487.75
  5. Step 5: Solve for x
    x = 228,487.75/516.72
  6. Step 6: Final answer
    x = 442.19

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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.