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Finding the Fourth Proportional to 476.99, 657.69 and 393.96

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Solution

The fourth proportional to 476.99, 657.69 and 393.96 is: 543.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.99 : 657.69 = 393.96 : x
  2. Step 2: Convert to fraction form
    476.99/657.69 = 393.96/x
  3. Step 3: Cross multiply
    476.99x = 657.69 × 393.96
  4. Step 4: Simplify right side
    476.99x = 259,104.54
  5. Step 5: Solve for x
    x = 259,104.54/476.99
  6. Step 6: Final answer
    x = 543.21

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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.