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Finding the Fourth Proportional to 516.79, 712.89 and 317.71

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Solution

The fourth proportional to 516.79, 712.89 and 317.71 is: 438.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.79 : 712.89 = 317.71 : x
  2. Step 2: Convert to fraction form
    516.79/712.89 = 317.71/x
  3. Step 3: Cross multiply
    516.79x = 712.89 × 317.71
  4. Step 4: Simplify right side
    516.79x = 226,492.28
  5. Step 5: Solve for x
    x = 226,492.28/516.79
  6. Step 6: Final answer
    x = 438.27

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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.