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Finding the Fourth Proportional to 516.61, 712.93 and 306.79

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Solution

The fourth proportional to 516.61, 712.93 and 306.79 is: 423.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.61 : 712.93 = 306.79 : x
  2. Step 2: Convert to fraction form
    516.61/712.93 = 306.79/x
  3. Step 3: Cross multiply
    516.61x = 712.93 × 306.79
  4. Step 4: Simplify right side
    516.61x = 218,719.79
  5. Step 5: Solve for x
    x = 218,719.79/516.61
  6. Step 6: Final answer
    x = 423.38

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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.