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Finding the Fourth Proportional to 516.81, 712.89 and 320.52

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Solution

The fourth proportional to 516.81, 712.89 and 320.52 is: 442.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.81 : 712.89 = 320.52 : x
  2. Step 2: Convert to fraction form
    516.81/712.89 = 320.52/x
  3. Step 3: Cross multiply
    516.81x = 712.89 × 320.52
  4. Step 4: Simplify right side
    516.81x = 228,495.50
  5. Step 5: Solve for x
    x = 228,495.50/516.81
  6. Step 6: Final answer
    x = 442.13

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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.