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Finding the Fourth Proportional to 516.88, 775.56 and 208.72

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Solution

The fourth proportional to 516.88, 775.56 and 208.72 is: 313.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.88 : 775.56 = 208.72 : x
  2. Step 2: Convert to fraction form
    516.88/775.56 = 208.72/x
  3. Step 3: Cross multiply
    516.88x = 775.56 × 208.72
  4. Step 4: Simplify right side
    516.88x = 161,875.46
  5. Step 5: Solve for x
    x = 161,875.46/516.88
  6. Step 6: Final answer
    x = 313.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.